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LHS - CosA/(1-tanA) + sinA/(1-cotA) => cosA/cotA + sinA/tanA => cosA/cosA/sinA + sinA/sinA/cosA => cosA×sinA/cosA + sinA × cosA/sinA => sinA + cosA ( since, sinA get cancelled by sinA and cosA get cancelled by cosA) . Now, LHS = RHS. So, it's prove.

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Sahil ??? 6 years, 2 months ago

LHS=cosA/(1-tanA)+sinA/(1-cotA). =cosA/(1-sinA/cosA) +sinA/(1-cosA/sinA). =cosA/(cosA-sinA)/cosA+sinA/(sinA-cosA)/sinA. =cos^2A/(cosA-sinA)+sin^2A/(sinA-cosA). =(-1)(cos^2A)/(-1)(cosA-sinA)+sin^2A/(sinA-cosA). = -cos^2A/(sinA-cosA)+sin^2/(sinA-cosA). =(sin^2A-cos^2A)/(sinA-cosA). =(sinA+cosA)(sinA-cosA)/(sinA-cosA). =sinA+cosA.

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72 degree

Posted by Gopal Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

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Hcf of 123 and 123

Posted by Gopal Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Aadya Singh ? 6 years, 2 months ago

123

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Sahil ??? 6 years, 2 months ago

HCF=123

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Kamal Yadav 6 years, 2 months ago

123

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Chapter 14 ka exercise 14•4 question number 2

Posted by Chandan Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Rahul Ranjan Singh 6 years, 2 months ago

Plz send questions

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The circumfere of a circle is 88 cm find the area of the sector whose central angle is 72

Posted by Chandan Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Rahul Ranjan Singh 6 years, 2 months ago

Circumference of circle=88cm So,2πr=88 Radius=14cm Area of sector=Φ°\360°*πr² So,72°/360°*πr² Hence,72°/360°*22/7*14*14 =123.5cm²

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Chandan Kumar 6 years, 2 months ago

Thanks

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Sahil ??? 6 years, 2 months ago

123.2 cm^2

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The wheels of a car are of diameter 80cm each. How many complete revolutions does each wheel makein 10minutes when the car is travelling at a speed of 66km per hour?

Posted by Shivam Pandey Monu Pandey 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sahil ??? 6 years, 2 months ago

No. of revolutions=4375

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medium in Punjabi

Posted by Kajalpreetkourgill Kajalpreetkourgill 6 years, 2 months ago

CBSE > Class 10 > Mathematics

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Exercise 11.1

Posted by Manish Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

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What is the area of hemisphere???

Posted by Satish ?? 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Mayank Sharma 6 years, 2 months ago

Curved surface area = 2πr² and total surface area=3πr²

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X2+2x-3 is a factor of x4+6x3+2ax2+bx-3a find the value of a and b

Posted by Sawliha Patel 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sahil ??? 6 years, 2 months ago

a=5 and b=-2

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Technometry

Posted by Pragrati Rathore 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

~ Honey... ?? 6 years, 2 months ago

It's Trigonometry

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Rocking Star 6 years, 2 months ago

It's trigonometry

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8 chapter ka 8.1 ka 5 questions

Posted by Mohd Saifi 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Devansh Pandey 6 years, 2 months ago

Sec A= h/b = 13/12. Let h= 13x and b=12x. Then p= √13x * 13x - 12x * 12x. = √169x² - 144x². = √25x². = 5x. 1. CosecA= h/p. =13x/5x. =13/5. 2. CotA =b/p. = 12x/5x. =12/5. 3. SinA = p/h. =5x/13x. =5/13. 4. CosA = b/h = 12x/13x = 12/13. 5. TanA = p/b = 5x/12x = 5/12

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1+cosA\sinA=sinA /1-cosA

Posted by Natik Goyanka 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Ujjwal Ujjwal 6 years, 2 months ago

ans In LHS 1+cos A/SinA each side dividing by1-cosA (1-cosA)×(1+cosA)/(1-cosA)×sinA 1-cos^2A/1-cosA×sinA we know the property =1-cos^2A=sin^2A

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Answer key of maths 2017-18

Posted by Ashvin Bhai Chodvadiya 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Student Lyf ? 6 years, 2 months ago

For what sample paper or anything else.?

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A room 4.9 m long and 3.5m broad is covered with carpet leaving an uncovered margin of 25cm all around the room. If the breadth of the carpet is 80 cm find its cost at Rs 80 per metre

Posted by Madhu Kumari 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 2 months ago

Width of the room left uncovered = 0.25 m
Now, Length of the room to be carpeted = 4.9 - (0.25+0.25) = 4.9 -0.5 = 4.4 m
Breadth of the room be carpeted = 3.5 - (0.25+0.25) = 3.5-0.5 = 3 m
Area to be carpeted = 4.4 {tex}\times{/tex} 3 = 13.2 m²
Breadth of the carpet 80 cm = 0.8 m
We know, Area of the room = Area of the carpet
^{Length of a carpet = {tex}\frac { \text { Area to be carpeted } } { \text { Width of a carpet } }{/tex}} = {tex}\frac { 13.2 } { 0.80 }{/tex} = 16.5
Cost of carpet = Rs. 80 per metre
{tex}\therefore{/tex} cost of 16.5 m carpet = Rs. 80 {tex}\times{/tex} 16.5 = Rs. 1320

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Sample paper 2019

Posted by Abdul Rahman Zafrulla Baig 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 2 months ago

You can check our website and app.

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If a line is drawn parallel to one of a triangle to intersect the other two sides in distinct points,the other two sides are divided in same ratio

Posted by M H Shah M H Shah 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Devansh Pandey 6 years, 2 months ago

Thales theorem

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2+2+3/5+54+5%

Posted by Shivansgu Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Sahil ??? 6 years, 2 months ago

58.65

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Aadya Singh ? 6 years, 2 months ago

58.65

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2+2÷2+2÷2+2÷2-2=_

Posted by Arshdeep Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

6 answers

Om Gupte 6 years, 2 months ago

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Md Zaki 786 6 years, 2 months ago

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Sumit Gautam 6 years, 2 months ago

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Tannu ? 6 years, 2 months ago

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Aadya Singh ? 6 years, 2 months ago

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Arshdeep Singh 6 years, 2 months ago

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_ + _ =8 + + _ - _ =6 = = 13 8

Posted by Piyush Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

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

What is this

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Define Distance formula

Posted by Supriya Sharma 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

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

√(x2 - x1)^2 + (y2 - y1) ^2

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Theoram 6.3

Posted by Jayesh Lokhande 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Devansh Pandey 6 years, 2 months ago

If in two triangles, corresponding angles are equal, then their corresponding sides are in the same ratio and hence the two triangles are similar.

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Real number formula

Posted by Khusboo Teli 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Supriya Sharma 6 years, 2 months ago

a=bq + r

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Prince Yadaw 6 years, 2 months ago

Euclid’s Division Algorithm (lemma): According to Euclid’s Division Lemma if we have two positive integers a and b, then there exist unique integers q and r such that a = bq + r, where 0 ≤ r ≤ b. (Here, a = dividend, b = divisor, q = quotient and r = remain

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Show that cube of any positive integer is of the form 9m, 9m+1, 9m+8, for some integer m

Posted by Vikram Singh 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Devansh Pandey 6 years, 2 months ago

Let a be a positive integer and b = 3. Then r =0,1or2. Case first when r is equal to zero. a= ( 3q+0)² =9q² =3(3q²)=3m where m is equal to 3q². Case second when r is equal to 1. a= (3q+1)²= (3q)²+ 2*3q +1²= 9q²+6q+1 =3(3q²+2q)+1 = 3m+1. Where m is equal to 3q²+2q. Case 2nd when r is equal to 2. a= (3q+2)² = (3q)²+ 2*3q*2 +2² =9q²+12q+4 =9q²+12q+3+1 =3(3q²+12q+1)+1 =3m+1. Where m is equal to 3q²+12q+1

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(a+b)*(a-b)

Posted by Bunny Bollavatri 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

It'S Me Aadarsh 6 years, 2 months ago

a²-b² ?

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Abhinav ? 6 years, 2 months ago

a^2-b^2

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Sahil ??? 6 years, 2 months ago

a^2-b^2

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If points(p,0),(0,q) and (2,2) are collinear,then choose the right option (1) 1/p+1/q=1/2 (2) 1/p-1/q=2 (3) 1/p+1/q=1 (4) 1/p+1/q=3

Posted by Amresh Kumar 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Sahil ??? 6 years, 2 months ago

Since the ponts are collinear thus area=0. p(q-2)+0(2-0)+2(0-q)=0 => pq-2p+0+0-2q=0. pq-2p-2q=0 => pq=2p+2q => pq=2(p+q). 1/2=(p+q)/pq => 1/2=p/pq+q/pq =>1/2=1/q+1/p. 1/p+1/q=1/2???

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Aadya Singh ? 6 years, 2 months ago

How?

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Sahil ??? 6 years, 2 months ago

(1)1/p+1/q=1/2

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Why pie is irrational number

Posted by Kamla Chand 6 years, 2 months ago

CBSE > Class 10 > Mathematics