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Reduction formulas can be used to comput...

Reduction formulas can be used to compute integrals of higher power of `sinx,cosx,tanx` etc.
`intsin^(5)xdx=-(1)/(5)sin^(4)xcosx+Asin^(2)xcosx-(8)/(15)cosx+C` then `A` equals

A

`-(2)/(15)`

B

`-(3)/(5)`

C

`-(4)/(15)`

D

`-(1)/(15)`

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