Question

prove that 1 + Cos A by sin square A is equal to 1 by 1 - cos a​

Answer 1

ur question is proved above

Answer 2

Answer:

$\displaystyle\frac{1+\cos A}{\sin^2A} = \frac{1+\cos A}{1-\cos^2A}\\\\{}\qquad\qquad=\frac{1+\cos A}{(1-\cos A)(1+\cos A)}\\\\{}\qquad\qquad=\frac1{1-\cos A}$