Hey Guys and Girls!

I need some help answering one of my homework questions. This is from Grade 12u Advanced Functions.

I've done other examples, but this one seems to confuse me.

Prove the identity:

sinxcosxtanx= 1 - cos^2x

This is what I've done so far:

Left Side:

=sinxcosx(sinx/cosx)

and from here I don't know what to do, but my guess would be:

= sin^2x/ cos^2x

Which means both sides are not equal?

Right Side:

1 - cos^2x

=sin^2x

Thanks for any help you can give me!