Question

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

work only on one side

Answer 1

\[RHS=\frac{1-\sin^2x}{1-\cos^2x}\]
\[=\frac{\cos^2x}{\sin^2x}\]
\[\cot^2x=RHS\]

Answer 2

*LHS at first

Answer 3

got it, thanks!