Question

Help me prove LHS equal to RHS?
- tan2x + sec2x = 1

Answer 1

\[-\tan^2x + \sec^2x = 1\]

Answer 2

Look up your Pythagorean identities. What is sec^2 x ?

Answer 3

That's what I thought. Sec^2x is 1-tan^2 x, so then that and the negative cancel out, leaving just one. Awesome.

Answer 4

yep

Answer 5

Thank you!