evaluate each indefinite integral
4) \int -(2*csc^(2)2x)/(cot(2x)*\sqrt(cot^(2)2x-1)); u=cot2x
5) \int (10x^(4))/(9+4x^(10)); u=2x^(5)
6) \int (20x^(3))/(\sqrt(25-25x^(8)))
7) \int (1)/(x\sqrt(25-(ln-2x)^(2)))
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