Question

Verify the equation is an identitiy:

cot(x)tan(x+pi) - sin(pi-x)cos((pi/2)-x) = cos^2x

Thanks

Answer 1

tan(x+pi)=tan(x)

sin(pi-x)=sin(x)
cos(pi/2-x)=sin(x)
cot(x)tan(x)=1
1-sin^2(x)=cos^2(x)