Please help me proof the identity. This isn't even math to me, I can not understand it so please show all work. God bless

Question

A)1-cos2x/sin2x=tanx

B) sin4x/sinx=4cosxcos2x

Answer 1

If this isn't even math to you, you clearly haven't been paying attention during the discussion of the double-angle formulas ...

(1-cos2x)/sin2x
= (1-(2cos^2x-1))/(2sinx cosx)
= (2-2cos^2x)/(2sinx cosx)
= 2sin^2x/(2sinx cosx)
= sinx/cosx
= tanx

sin4x/sinx
= (2sin2x cos2x)/sinx
= (2*2sinx cosx cos2x)/sinx
= 4cosx cos2x

Answer 2

Sorry steve not everyone is as smart as you. Thanks for your help tho