Question

What are the steps to solve/verify this

Answer 1

Hope this helps
pls ask if you don't understand

Answer 2

Tan^2 x - Tan^ x sin^2 x

= tan^2x ( 1 - sin^2 x)

= tan^2 x * cos^x

=  sin^2 x * cos^2 x
    ----------------------
          cos^2 x

= sin^2 x