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

Question

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

ujjwal · Answer

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

anonymous · Answer

Did Nt understood that

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

ujjwal · Answer

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.

ujjwal · Answer

Convert all to cos

anonymous · Answer

should be add  simply sin^2 (0)

ujjwal · Answer

What is the value of sin0 ?

anonymous · Answer

ok i get it thanzzzz   @ujjwal

anonymous · Answer

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

anonymous · Answer

@ujjwal  can u do chemistry

ujjwal · Answer

@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.

anonymous · Answer

ok