# Itegration help

1. May 11, 2010

### TromboneNerd

how can i use u substitution to solve $$\int tan^{4}(x)dx$$?

I am not allowed to use a table, so i cant use the $$\int tan^{n}(u)du$$ formula. I have no work since i can't even make it fit $$\int udu$$. help?

2. May 11, 2010

### Cyosis

Use the identity $1+\tan^2x=\sec^2x$.

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