Question

(sin^2(x)+cos^2(x))/(1-sin^2(x))

Answer 1

Use the following trig identity
\[\sin^2x+\cos^2x=1\]
and
\[1-\sin^2x=\cos^2x\]
Simplify

Answer 2

So then you would get 1/cos^2(x) but does that reduce to just sec^2(x)?