Question

Verify.

Answer 1

\[\tan ^{2}u-\sin ^{2}u=\tan ^{2}u \sin ^{2}u\]

Answer 2

I think I got it.

Answer 3

Turn tan u into sin(u)/cos(u). Along with the exponent.
Factor out sin^2(u)
Take it from there.

Answer 4

Awesome, thanks

Answer 5

Awesome, thanks