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∫ 1/sin⁴x dx= ∫ csc⁴x dx= ∫ csc²x d(-cotx)= -cotxcsc²x + ∫ cotx d(csc²x)= -cotxcsc²x - 2∫ cot²x•csc²x dx= -cotxcsc²x + 2∫ cot²x d(cotx)=...
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