Question

If sin  = , a b then find cos .

Answer 1

Hi

Here I am using X instead of theta

It is given that ,

Sin X = a / b

Cos x = √( 1 - sin² x )

= √ [ 1 - ( a/b )² ]

= √ [ ( b² - a² ) / b²

= √ ( b² - a² ) / b

I hope this helps you.