Question

Explain me this 4stepss.

plzz

Answer 1

${ \sec}^{2} x.sin x = \frac{1}{ {cos}^{2}x } sin x \\ = \frac{sin x}{cos x} sin x = tan x.sin x \\ \\ then \: integrate$
integration of secx tanx is sec x

Answer 2

here is the answer in picture