Thread: Deriving an Identity from another

I have been trying to work out a problem from my homework set and cannot get it. I have to use the identity

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

to derive the identity

tan^2(x) + 1 = sec^2(x)

I would appreciate it if someone could just give me a hint on how to solve this problem. I have tried this numerous ways but cannot get it.

Thanks

Divide both sides by . See what you get

Thanks! I tried everything else except that I cannot believe I missed that