How to prove that (sin4x/1-cos4x)×(1-cos2x/cos2x)=tanx

Question

Please help me i have been stuck on this for 2 hours now and its depressing me to unreasonable depths.

Answer 1

(sin4x/(1-cos4x))*((1-cos2x)/cos2x)=

=2sin(2x) cos(2x)/(2sin²(2x))*2sin²(x)/cos(2x)

=cos(2x)/sin(2x)*2sin²(x)/cos(2x)=

=2sin²(x)/(2sin(x)cos(x))=sin(x)/cos(x)=tan(x)