Solving \int tan^{4}(x)dx Without a Table

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

I am not allowed to use a table, so i can't use the \int tan^{n}(u)du formula. I have no work since i can't even make it fit \int udu. help?
 
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Use the identity 1+\tan^2x=\sec^2x.
 

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