Question 861494
prove: 1 + tan^2 x/csc^2 x = tan^2 x
start with left side:
(1 + tan^2 x)/csc^2 x
sec^2(x)/csc^2(x)
(1/cos^2(x))/(1/sin(x))
sin^2(x)/cos^2(x)=tan^2(x)
verified: left side=right side