Incorrect URL accessed!!!!

Gaurav Seth 6 years, 2 months ago

Given that,

S7 = 49
S17 = 289
S7

= 7/2 [2a + (n - 1)d]
S7 = 7/2 [2a + (7 - 1)d]
49 = 7/2 [2a + 16d]
7 = (a + 3d)
a + 3d = 7 ... (i)
Similarly,
S17 = 17/2 [2a + (17 - 1)d]
289 = 17/2 (2a + 16d)
17 = (a + 8d)
a + 8d = 17 ... (ii)
Subtracting equation (i) from equation (ii),
5d = 10
d = 2
From equation (i),
a + 3(2) = 7
a + 6 = 7
a = 1
Sn = n/2 [2a + (n - 1)d]
= n/2 [2(1) + (n - 1) × 2]
= n/2 (2 + 2n - 2)
= n/2 (2n)
= n²

3Thank You

ANSWER

Why may i not multiply with 0 both sides in trigonometric identity to equal rhs and lhs

Posted by Vishal Raj 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Aadya Singh ? 6 years, 2 months ago

No, we can't multiply with 0.

4Thank You

Priyanshu Sinha 6 years, 2 months ago

We can't equate a problem by multiplying 0 on both side because, when We multiply a number on both side, The division of both the number should be equal to 1. For example;. 3x+y=k. If we multiply 0 by both side. 0(3x+y)=0k. Here the division of 0 by 0 is undefined in maths .0/0 is indeterminate means it can't be defined

4Thank You

ANSWER

If cosA-sinA=√2 sinA prove that cosA+sinA=√2sinA

Posted by Priyanshu Sinha 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Priyanshu Sinha 6 years, 2 months ago

No it is not wrong

Moxit Rewar 6 years, 2 months ago

Please check your question. I think it's wrong???

ANSWER

How can we find quadrants of an equations?

Posted by Viraj Baldaniya 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Moxit Rewar 6 years, 2 months ago

By finding the value of x and y

Viraj Baldaniya 6 years, 2 months ago

If equation is x+y=2 then how can you find thier quadrant?

Dhruv ... 6 years, 2 months ago

By findind the value of ordinate and abscissa i.e.(x,y)

ANSWER

Why any number when divided by 0 gives ''not defined''.

Posted by Reena Gour 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Rachit Agarwal 6 years, 2 months ago

Because if multiply anything with 0 we will always get 0 Like 10/5 = 5+5/5= 5/5+5/5= 1+1=2 But 10/0 we cant express in the form of zero There will be infinite zero . Thats why we say its not defined

ANSWER

What is rational number?.

Posted by Pradeep Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

5 answers

Dhruv ... 6 years, 2 months ago

Number in the form of p/q where q is not equal to zero...and p and q are integers.

Mona Mittal 6 years, 2 months ago

The numbers of the form p/q ,where p and q are integers, and q is not 0 are called rational no.

Aadya Singh ? 6 years, 2 months ago

The number written in the form of p/q , where p and q are integers and q isn't equal to 0.

Payal .....?? 6 years, 2 months ago

No. Which we can write in the form of p/q wher p and q are integers and q is not equal to 0

Secret Girl... ? 6 years, 2 months ago

Those nos that can be expressed as questient or fraction p/q of 2 integers

ANSWER

Maths me kese krege maths bhut tough hai vo bhi cbse ka h please kuch bta do maths ke liye hme school me maths ka standard form de diya

Posted by Piyush Patidar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Harshal Dhawale 6 years, 2 months ago

Refer RD Sharma

Pushkar Sahi 6 years, 2 months ago

maths ka har formula ache se yad kar lo uske baad bahut easy ho jayega

Bhavi Chauhan 6 years, 2 months ago

Maths is easy.Pahle ncert complete kro uske baad exemplar and support material provided by cbse online...this will help u

Shristi Arya?? 6 years, 2 months ago

Padhkar

ANSWER

The sides of a right triangle are cleared up 25 24 and submitted at the three corners of the field of cow and buffalo and horse I tried separately with the rope for 3.5 feet to Grace in the field find the area of the field that cannot be graced by these animals

Posted by Aryan Tiwari 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Prove that if a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points then the other two sides are divided in the same ratio

Posted by Aryan Tiwari 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Rachit Agarwal 6 years, 2 months ago

You just see ch 6 triangles and theorem 6.1

Pushkar Sahi 6 years, 2 months ago

bahut lamba question h bhai apna number de do bhej denge

ANSWER

A n is equal to 6 n plus 5 then a n plus 1 is equal to

Posted by Sanyam Sanyam 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Bhavi Chauhan 6 years, 2 months ago

An=6n+5 An+1=6n+5+1 =6n+6

ANSWER

Prove that if a line is drawn parallel to one side of a triangle to intersect the other two sides in the distinct. Points Then the other two sides are divided in the same ratio

Posted by Aryan Tiwari 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Samson Gaur 6 years, 2 months ago

By BPT theoram

Harshal Dhawale 6 years, 2 months ago

proof of basic praportionality theorem

ANSWER

For a given data with 70 observation the less than a drive and the more than ogive intersect at 20.5, 30 what will be the median of the data

Posted by Manya Batra 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Pushpendra Yadav 6 years, 2 months ago

Solution lamba hii

ANSWER

Cos sq 67-sinsq23

Posted by Manish P Singh Pal 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Ansh Singh Singh 6 years, 2 months ago

Cos^2 67- Sin^2 23 Cos^2(90-23) - Sin^2 23 Sin^2 23 -Sin^2 23 0 Hence proved...

Pushkar Sahi 6 years, 2 months ago

cos sq67 - sin sq23 =cos sq(90-23) - sin sq23 =sin sq23-sin sq23 =0

Payal .....?? 6 years, 2 months ago

Cos²a 67 - cos²(90 - 23).................. Cos²a67 - cos² 67................ 0 is the answer

ANSWER

Hloooo

Posted by Ziddi Akshit?????? ??? 6 years, 2 months ago

CBSE > Class 10 > Mathematics

20 answers

Secret Girl... ? 6 years, 2 months ago

Excuse me!!

Piyush Patidar 6 years, 2 months ago

Mere answers reply kro

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Maine kr diya answer

Pushkar Sahi 6 years, 2 months ago

polarity wala question h

Pushkar Sahi 6 years, 2 months ago

science wala me dekhiye

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Question kya h??

Pushkar Sahi 6 years, 2 months ago

mera answer

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Sab gye ..!! Ok...bye..

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Hello payal...?

Payal .....?? 6 years, 2 months ago

Hii. Shreya and ziddi ji.... ???

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Kya question h apka..??

Pushkar Sahi 6 years, 2 months ago

mera science wala question ka answer kisi ne nahi diya mujhe??????

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Maine august mai join kiya h isko

Ziddi Akshit?????? ??? 6 years, 2 months ago

Jo marzi keh lo #pushkar

3Thank You

Ziddi Akshit?????? ??? 6 years, 2 months ago

Tum nayi ho kya yaha par

4Thank You

Pushkar Sahi 6 years, 2 months ago

acha ye app personal chat ke liye h kya

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Ziddi..???

Payal .....?? 6 years, 2 months ago

Nhi... But itna ziddi kon hota hhh...... ???????

Ziddi Akshit?????? ??? 6 years, 2 months ago

Hasne ki kya baat h

Payal .....?? 6 years, 2 months ago

Ziddi....??

3Thank You

ANSWER

Value of sin(90-1)

Posted by Shekhar Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Aaditya Choudhary 6 years, 2 months ago

Cos 1

Shreya... #Be Positve Be Happy 6 years, 2 months ago

Cos A

Payal .....?? 6 years, 2 months ago

CosA....

Manak Fangirl 6 years, 2 months ago

Sin (90-A) = Cos A

ANSWER

cosec(4a)=sec(a-20) find the value of a.

Posted by Pushkar Sahi 6 years, 2 months ago

CBSE > Class 10 > Mathematics

5 answers

Ansh Singh Singh 6 years, 2 months ago

Cosec(4A)=Sec(A-20) Cosec(4A)=Sec{90-(A-20)} Cosec(4A)=Cosec(90-A+20) Cosec(4A)=Cosec(110-A) 4A=110-A 5A=110 A=22 Solved....

Sakshi Banitia 6 years, 2 months ago

cosec(4a)=sec(a-20) sec(90-4a)=sec(a-20) 90-4a=a-20 -4a-a=-20-90 -5a=-110 a=22

Manak Fangirl 6 years, 2 months ago

A=22

Payal .....?? 6 years, 2 months ago

Cosec (4a) = cosec (90-(a- 20))......... Cosec (4a) = cosec (110 - a)......... (4a) = 110-a...... 5a=110..... a= 22...... Hope it will help u....

⛩️Singh Empire? (Believe In Study)? 6 years, 2 months ago

ANSWER

sin⁴A -sin²A = cos⁴A - cos²A

Posted by Diya Paul 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Ansh Singh Singh 6 years, 2 months ago

LHS= Sin^4A- Sin^2A Taking Sin^2A common we get, Sin^2A( Sin^2-1) (1-cos^2A) (-cos^2A) On multiplying we get, -Cos^2A + Cos^4A Cos^4A - Cos^2A Hence proved.

Payal .....?? 6 years, 2 months ago

Lhs........... So...... Sin⁴a -sin²a ===== (1-cos²a) ² - 1- cos²a........ 1- cos⁴a -1-cos²a...... Cos⁴a -cos²a.... Hence proved. ..

Payal .....?? 6 years, 2 months ago

Ye prooff krna hhh n

ANSWER

Cot=7/8,evaluate:. (1+sin)(1-sin)/(1+cos)(1-cos)

Posted by Kunal Lambha 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Madhup Chandrashekhar 6 years, 2 months ago

cot=7/8 (1+sin)(1-sin)/(1+cos)(1-cos) =1^2-sin^2/1^2-cos^2 =cos^2/sin^2 [sin^2+cos^2=1] =cot^2 =(7/8)^2 49/64

ANSWER

Find the 10th term of the AP : 2 , 7 , 12

Posted by Roshan Khan 6 years, 2 months ago

CBSE > Class 10 > Mathematics

8 answers

Ansh Singh Singh 6 years, 2 months ago

A=2 D=5 T10 = A+(n-1)D 2+9*5 2+45 47

Anmol Tyagi 6 years, 2 months ago

A=2,d=5,n=10 an=? By using this formula,,an=a+(n-1)d =2+(10-1)5 =2+(9)5 =2+45 =47

Manak Fangirl 6 years, 2 months ago

Pushkar Sahi 6 years, 2 months ago

a=2, d=5 , T10=? we know, Tn= a+(n-1)d T10=2+(10-1)5 =2+9*5 =2+45 =47

Madhup Chandrashekhar 6 years, 2 months ago

a=2 d=t2-t1=7-2=5 n=10 T10=a+(n-1)d =2+(10-1)5 =2+45 =47

Kunal Lambha 6 years, 2 months ago

Payal .....?? 6 years, 2 months ago

Hiii

⛩️Singh Empire? (Believe In Study)? 6 years, 2 months ago

ANSWER

Side AB and AC and median AD of a triangle ABC are respectively proportional to sides PQ and PR and median PM of another triangle PQR. Show that triangle ABC~triangle PQR

Posted by Ali Khan 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

tanA/1+secA-tanA/1-secA=2cosecA

Posted by Pushkar Sahi 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Madhup Chandrashekhar 6 years, 2 months ago

LHS = tanA/1+secA-tanA/1-secA = tanA-tanAsecA-(tanA+tanAsecA)/1^2-sec^2 = -2tanAsecA/-tan^2 [tan^2+1=sec^2] = 2secA/tanA =2cosecA

ANSWER

A theif after commiting a theft runs at a uniform speed of 50m/min. After 2 min. ,A policemen runs to catch him. He goes 60m in first min. And increases his speed by 5m/min. Every succeeding min. After how many min. The policeman will catch the theif?

Posted by Saloni Pundir 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Shreya Roy 6 years, 2 months ago

The answer is after 5 minutes when he starts running....hope it helps...

Shreya Roy 6 years, 2 months ago

Is this from R D sharma?

ANSWER

To verify the basic proportionality theorem using parallel line board and triangle cut outs

Posted by Brajesh Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Define thales theirem

Posted by Satyam Pathak 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Gaurav Seth 6 years, 2 months ago

Basic Proportionality Theorem was first stated by Thales, a Greek mathematician. Hence it is also known as Thales Theorem. Thales first initiated and formulated the Theoretical Study of Geometry to make astronomy a more exact science. What is this theorem that Thales found important for his study of astronomy? Let us find it out.

Basic Proportionality Theorem (can be abbreviated as BPT) states that, if a line is parallel to a side of a triangle which intersects the other sides into two distinct points, then the line divides those sides in proportion.

Basic Proportionality Theorem

In the figure alongside, if we consider DE is parallel to BC, then according to the theorem,

ADBD=AECE

Let’s not stop at the statement, we need to find a proof that its true. So shall we begin?

PROOF OF BPT

Given: In ΔABC, DE is parallel to BC

Line DE intersects sides AB and PQ in points D and E, such that we get triangles A-D-E and A-E-C.

To Prove: ADBD=AECE

Construction: Join segments DC and BE

Proof:

In ΔADE and ΔBDE,

A(ΔADE)A(ΔBDE)=ADBD (triangles with equal heights)

In ΔADE and ΔCDE,
A(ΔADE)A(ΔCDE)=AECE (triangles with equal heights)
Since ΔBDE and ΔCDE have a common base DE and have the same height we can say that,
A(ΔBDE)=A(ΔCDE)
Therefore,
A(ΔADE)A(ΔBDE)=A(ΔADE)A(ΔCDE)
Therefore,
ADBD=AECE

Aadya Singh ? 6 years, 2 months ago

If a line is drawn parallel to 1 side of a traingle to intersect the other 2 sides in distinct point, then the other 2 sides are divided in the same ratio.