Hello, the help is very appreciated.

I'm asked to but not sure how to integrate the following:

tan(x)^4*dx

Many of our trig integration problems use the identities to simplify the integral, but I don't see how the identities could apply here.

Wolfram Alpha suggested using a (foreign to our class, I believe) reduction formula in the link below.

http://www.wolframalpha.com/input/?i=integrate+tan^4

I don't think we used this formula in class though. Are there any other ways of solving this?