Question 817525
Verify the identity: sin^2x+sin^2xtan^2=tan^2x
start with left side:
{{{sin^2(x)+sin^2(x)tan^2(x)=sin^2(x)(1+tan^2(x))
=sin^2(x)sec^2(x)=sin^2(x)/cos^2(x)=tan^2(x)}}}
..
verified: left side=right side