Question

prove that cos square a (1- cos a)/ sinsquare (1- sin ) = 1+ sin a / 1+ cosa​

Answer 1

1) numerator put cos2a =1-sin2a and in denominator put sin2a=1-cos2a

2) now use property a²-b²= (a+b) (a-b) both in numerator and denominator

3) simplify