Question 978241
Starting with lefthand side,
{{{cos^2(x)/(sin(x)-csc(x))}}}


{{{cos^2(x)/(sin(x)-1/sin(x))}}}


{{{cos^2(x)/(sin(x)sin(x)/sin(x)-1/sin(x))}}}


{{{cos^2(x)/((sin^2(x)-1)/sin(x))}}}


{{{cos^2(x)/((1-cos^2(x)-1)/sin(x))}}}


{{{cos^2(x)/(-cos^2(x)/sin(x))}}}


{{{1/(-1/sin(x))}}}
and you can see the last step...