1.

`int cot theta^(3) cosec^(2) theta d theta` का मान ज्ञात कीजिए।

Answer» माना `cot theta = t rArr - coses^(2) theta d theta dt`
`therefore int cot^(3) theta cosec^(2) theta d theta = - int t^(3)dt = - (t^(4))/(4) - - (cot^(4) theta)/(4)`


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