Question

1+cos A/1-cos A

please solve it ​

Answer 1

It is  ( cos  e c A − cot A )^ 2

Explanation:

At first multiply and divide this with (1-cos A)  

1 − cos A 1 + cos A ⋅ 1 − cos A 1− cos A  = ( 1 − cos A) 2 1 − cos 2 A  = ( 1 − cos A ) 2 sin 2 A  = (1 sin A − cos A sin A ) 2  = ( cos e c A − cot A ) 2