Question

sin^2(5) + sin^2(10) +............+sin^2(90)/(1+cos^2(5) + cos^2(10)......cos^2(90)) = ?

Answer 1

http://openstudy.com/study#/updates/4fc8b27de4b022f1e1302823

Answer 2

Did Nt understood that

Answer 3

Try to use the fact that cos( 90 - A) = sinA.

Answer 4

OK i used it and got 1/2 but the answer should be 1

Answer 5

There you would see that, waiiittt.
The numerator would be equal to the denominator. You should be left with 1, I guess.

Answer 6

Add a sin^2 (0) to numerator. And in denominator, 1=cos^2 (0).

Now, Sin^2 theta = cos^2 (90-theta)

Proceed yourself further.

Answer 7

Convert all to cos

Answer 8

should be add simply sin^2 (0)

Answer 9

What is the value of sin0 ?

Answer 10

ok i get it thanzzzz @ujjwal

Answer 11

Yeah. Look, sin^2 5 = cos^85. sin^ 10 = cos^80. Hence all terms equal.

Answer 12

@ujjwal can u do chemistry

Answer 13

@shakir Don't tag me in your questions. And don't send me messages providing links to your questions.. you will get help but you must wait for a while..
And i am not that good in chemistry.

Answer 14

ok