Question

verify -tan^2x+sec^2x=1?

Answer 1

Hints:

\(\Large tan^2 (x) = \frac{sin^2(x)}{cos^2(x)}\)

\(\Large sec^2(x) = \frac{1}{cos^2(x)}\)

\(\Large sin^2(x) + cos^2(x) = 1\)

If you use these three identities, you can verify the identity they gave you :)