Question 966527
prove the identity: 
sin2x=(2cotx)/(csc^2x)
start with right side
{{{2cotx/csc^2(x)}}}
{{{(2cosx/sinx)/(1/sin^2(x))}}}
{{{(2cosx/sinx)*(sin^2(x))}}}
2cosxsinx=sin2x
verified: right side=left side