Which doubleangle or halfangle identity would you use to ver

Which double-angle or half-angle identity would you use to verify the following: csc x sec x = 2 csc 2x cos 2x = 1 -12 sin^2x sin 2x = 2 sin x cos x tan 2x = 2 tan x/1 - tan^2x cos 2x = 2cos^2x - 1

Solution

I wll use the Option B

let me show you how.

right hand sde = 2cosec2x

=2/sin2x

sin2x=2sinxcosx

=2/2sinxcosx

=1/sinxcosx

cscxsecx

thank you