1.

`int (cot x)/((cosec x - cot x)) dx = ?`A. `-cosec x - cot x - x + C`B. `cosec x - cot x - x + C`C. `-cosec x + cot x -x + C`D. `cosec x + cot x -x + C`

Answer» Correct Answer - A
`I = int{(cotx)/((cosecx - cot))xx ((cosecx + cotx))/((cosec x + cotx))} dx`
`= int(cosecx cot x + cot^(2)x) dx = int(cosecx cotx +cosec^(2)x - 1) dx`.


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