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How can i integrate this?

how can i integrate this: int tan^4 (5x) dx ?

tan^4 (5x) = tan^2 (5x)* tan^2 (5x)
= tan^2 (5x)* (sec^2(5x) - 1)
= tan^2 (5x)*sec^2(5x) - tan^2 (5x)
= tan^2 (5x)*sec^2(5x) - (sec^2(5x) - 1)
= tan^2 (5x)*sec^2(5x) - sec^2(5x) + 1

can now use the chain rule for integration

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