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Sina ( 1+tana)+cosa(1+cota)

Posted by Nikita Joshi 7 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Shatayu Ganvir 7 years, 9 months ago

Coseca + seca

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If the roots of the equation( a square + b square)x square _ 2 (ac+bd ) x+(c square +d sqare)=0 are equal ,prove that a/b=c/d

Posted by Kantilal Patel Kantilal Patel 6 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 5 months ago

According to the question,the given equation is,
(a² + b²)x² - 2(ac + bd)x + (c² + d²) = 0
The discriminant of the given equation is given by
D = [-2(ac + bd)]² - 4 {tex}\times{/tex} (a² + b²) {tex}\times{/tex} (c² + d²)
{tex}\Rightarrow{/tex} D = 4(ac + bd)² - 4(a²c² + a²d² + b²c² + b²d²)
{tex}\Rightarrow{/tex} D = 4(a²c² + b²d² + 2abcd) - 4(a²c² + a²d² + b²c² + b²d²)
{tex}{/tex}D= 4(2abcd - a²d² - b²c²)
{tex}\Rightarrow{/tex} D = -4[(ad)² + (bc)² - 2(ad)(bc)]
{tex}\Rightarrow{/tex} D = -4(ad - bc)²
Since the roots of the given equation are given to be equal, therefore,
Discriminant, D = 0
{tex}\Rightarrow{/tex} -4(ad - bc)² = 0
{tex}\Rightarrow{/tex} (ad - bc)² = 0 [as -4 {tex}\ne{/tex} 0]
{tex}\Rightarrow{/tex} ad - bc = 0
{tex}\Rightarrow{/tex} ad = bc
{tex} \Rightarrow \frac{a}{b} = \frac{c}{d}{/tex}

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How many marks School send out of 100

Posted by Shrinivas Jangid 7 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

C C 7 years, 9 months ago

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How to solve : Cos48 . Cos 42 + Cos 48 . Cos 42 = 2

Posted by Pranavsinh Rajput 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Vaibhav Jain 7 years, 9 months ago

Noo sorry it's wrong ??

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Vaibhav Jain 7 years, 9 months ago

It's too easy just convert cos 42 into sec 48° anwe know that sec theta × cos theta =1 than add 1+1 =2

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In the given figure. Find p

Posted by Prabin Rai 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Jashan Preet Judge 7 years, 9 months ago

Whr is the figure??

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Deeksha Gupta 7 years, 9 months ago

Which figure

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How many times all of u have revised subjects

Posted by C C 7 years, 9 months ago

CBSE > Class 10 > Mathematics

7 answers

Vaibhav Jain 7 years, 9 months ago

Yes!

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C C 7 years, 9 months ago

It is also one of the best method right

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Vaibhav Jain 7 years, 9 months ago

I m solving sample papers

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C C 7 years, 9 months ago

Then how r u studying

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Vaibhav Jain 7 years, 9 months ago

Are really mene nhi Kiya h

1Thank You

C C 7 years, 9 months ago

Don't lie k

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Vaibhav Jain 7 years, 9 months ago

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How are all ur preparations for exams give me some tips

Posted by C C 7 years, 9 months ago

CBSE > Class 10 > Mathematics

4 answers

Shanaya Dabas 7 years, 9 months ago

My pre paration was good and you can do study when you are energetic

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Namrata Nath 7 years, 9 months ago

I can give you tip that wake up 4 o'clock in morning and at the time of morning only study hard subject with some coffee

1Thank You

C C 7 years, 9 months ago

Is it so

2Thank You

Nishant Verma 7 years, 9 months ago

My studies are very good but I can not give you tips..........

2Thank You

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How can we express sin60 at geomathical form.

Posted by Arsh Sheikh 7 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Akshit Kumar Yadav 7 years, 9 months ago

Yes to express sin 60 divide a equilateral triangle

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Find the perimeter of the shaded region if ABCD is a square of side 14 cm and two semi circles are drawn on two sides

Posted by Akshay Poonia 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Namrata Nath 7 years, 9 months ago

100 cm kese Mera to 12 cm aa r ha hi q ki jab perimeter of square Jo ki 56cm Aaya us me se 2 perimeter of circle Jo 44 cm Aaya to answer 12 hi aa ya . Aap Ka 100cm ke se Aaya please explain me??

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Online Only On Brnly Geniusvatsone 7 years, 9 months ago

100 cm

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Area of a sector of a circle is 1/6 of the area of circle. Find the degree measure of its minor arc

Posted by Rakshith Rocky 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Nishika Agrawal 7 years, 9 months ago

60°

1Thank You

Tejas Thete 7 years, 9 months ago

Anyone from Maharashtra

1Thank You

ANSWER

What is solenoid

Posted by Amit Singh 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Nishika Agrawal 7 years, 9 months ago

It is a long coil whivh had many turns of insulated copper wire and is cylindrical in shape.

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Online Only On Brnly Geniusvatsone 7 years, 9 months ago

Solenoid is long coil consisting of late no.of close circular turns of insulated copper wire

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Goodnight friends.. ???☺☺☺

Posted by Kevin Purwar 7 years, 9 months ago

CBSE > Class 10 > Mathematics

6 answers

Miss Unknown 7 years, 9 months ago

Gm???

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Miss Unknown 7 years, 9 months ago

Hey krishna#kevin?????

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Rahul Great 7 years, 9 months ago

Same to you

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Abcd Xyz 7 years, 9 months ago

Hloo kevin

1Thank You

Srishti Maurya Brainly Id Srishti 7 years, 9 months ago

Hello Mr. id

1Thank You

Rani L 7 years, 9 months ago

Good night

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I mean thik toh h na

Posted by Vaibhav Jain 7 years, 9 months ago

CBSE > Class 10 > Mathematics

6 answers

Vaibhav Jain 7 years, 9 months ago

Are I was in shock ki vo fake I'd kisi ldki ki thi

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Vaibhav Jain 7 years, 9 months ago

Really yr Bhut glat Kiya un logo ne

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Ishan G❤ 7 years, 9 months ago

Pta nahi kis kisne kri fake id se

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Ishan G❤ 7 years, 9 months ago

Kl uski bahut bezzati hu e

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Vaibhav Jain 7 years, 9 months ago

Hm.

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Ishan G❤ 7 years, 9 months ago

I hope

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Ab riddhi think toh h n

Posted by Vaibhav Jain 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Srishti Maurya Brainly Id Srishti 7 years, 9 months ago

Ishan ji pradam

1Thank You

Ishan G❤ 7 years, 9 months ago

I hope

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For what value of k+9 2k-1and 2k+7be the consecutive terms of an Ap

Posted by Akash Darur 7 years, 9 months ago

CBSE > Class 10 > Mathematics

8 answers

Nishika Agrawal 7 years, 9 months ago

They are in ap therefore, common difference is same. (2k-1)-(k+9)=(2k+7)-(2k-1) 2k-1-k-9=2k+7-2k+1 K-10=8 K=8+10 K=18

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Vaibhav Jain 7 years, 9 months ago

Whose answer is correct?

1Thank You

Vaibhav Jain 7 years, 9 months ago

2b = a+c. (K+9)+(2k+7) = 2(2 k+1). 3k+16 = 4k+2. -k = -14, k= 14

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Dhruv Gupta 7 years, 9 months ago

Sincecthey are in ap therefore there diff will be same 2k-1-(k+9)=2k+7-(2k-1) k=18

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Vaibhav Jain 7 years, 9 months ago

Just put identity : 2b= a+ c Answer: 14

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Hitesh Kumar 7 years, 9 months ago

0Thank You

Hitesh Kumar 7 years, 9 months ago

1Thank You

Sathish Kumar 7 years, 9 months ago

a+c =2b k+9+2k+7=2×2k-1 3k+16=4k-4 K=20

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_4+_1+2........ . .+x=437 solve the equation

Posted by Vipin Singh 6 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 5 months ago

(-4) + (-1) + 2 + 5 + ---- + x = 437.
Now,
-1 - (-4) = -1 + 4 = 3
2 - (-1) = 2 + 1 = 3
5 - 2 = 3
Thus, this forms an A.P. with a = -4, d = 3,l = x
Let their be n terms in this A.P.
Then,
S_n = {tex}\frac { n } { 2 } [ 2 a + ( n - 1 ) d ] {/tex}
{tex}\Rightarrow 437 = \frac { n } { 2 } [ 2 \times ( - 4 ) + ( n - 1 ) \times 3 ]{/tex}
{tex}\Rightarrow{/tex} 874 = n[-8 + 3n - 3]
{tex}\Rightarrow{/tex}874 = n[3n - 11]
{tex}\Rightarrow{/tex}874 = 3n² - 11n
{tex}\Rightarrow{/tex}3n² - 11n - 874 = 0
{tex}\Rightarrow{/tex}3n² - 57n + 46n - 874 = 0
{tex}\Rightarrow{/tex}3n(n - 19) + 46(n - 19) = 0
{tex}\Rightarrow{/tex}3n + 46 = 0 or n = 19
{tex}\Rightarrow n = - \frac { 46 } { 3 }{/tex} or n = 19
Numbers of terms cannot be negative or fraction.
{tex}\Rightarrow{/tex} n = 19
Now, S_n = {tex}\frac { n } { 2 } [ a + l ]{/tex}
{tex}\Rightarrow 437 = \frac { 19 } { 2 } [ - 4 + x ]{/tex}
{tex}\Rightarrow - 4 + x = \frac { 437 \times 2 } { 19 }{/tex}
{tex}\Rightarrow - 4 + x = 46{/tex}
{tex}\Rightarrow x = 50{/tex}

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Hy what do you think about Maths, Guys.

Posted by Mayank Rawal 7 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Sourav Khurana 7 years, 9 months ago

Ot is very intresting subj

1Thank You

Cuteness Overload Block Ho Gyi 7 years, 9 months ago

Hi sab Soo rahe ho kya

0Thank You

Aakshi Sharma 7 years, 9 months ago

It's fine but hard

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Sjdjxkdkcm

Posted by Abhay Singh 7 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

A election is conducted between the contestants A and B. Such that votes obtained by A is twice the no of the peoples in the electorate who had not casted their votes and this later no is equal to twice the majority A optains over B . Find the votes obtained by B

Posted by Shobhit Kumar 7 years, 9 months ago

CBSE > Class 10 > Mathematics

4 answers

Pawan Kumar 7 years, 9 months ago

Top m dekho

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Nandini Yadav 7 years, 9 months ago

I'm not getting what's written!!!

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Pawan Kumar 7 years, 9 months ago

You can use internet

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Pawan Kumar 7 years, 9 months ago

I have a question for all friends or not

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I posted bcoz he was irritating by increasing font size..

Posted by Kevin Purwar 7 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Pawan Kumar 7 years, 9 months ago

<a href="http://hi-static.z-dn.net/files/dc6/916cd8b666a7a6157ab26157ab2631a830a4dfa.JPG">??Good Morning??</a>

1Thank You

Pawan Kumar 7 years, 9 months ago

<html> <head> <title>Pawan</title> <body> <marquee bgcolor="blue" width="600" scrollamount="420">fontcolor="red" fontsize="8"> Hello Friends</marquee> </body> </head> </html>

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Pawan Kumar 7 years, 9 months ago

<marquee direction="right">Pawan <marquee>

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Kevin once again..