csc u du
csc u du =
csc u * csc u + cot u du = csc u + cot u
csc2 u + cot2 u du = cot u + csc u
--csc2 u - cot2 u du = cot u + csc u
- ln|cot u + csc u| + C
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csc u ducsc u du
csc u du =csc u * csc
u + cot u du =csc2
u + cot2 u du =-csc2
u - cot2 u du =