Derive reduction formula for l((n","m...

Derive reduction formula for
`l_((n","m))=int (sin^(n)x)/(cos^(m)x)dx`.

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The correct Answer is:

`I_(n","m)=(1)/((m-1))*(sin^(n-1)x)/(cos^(m-1)x)-((n-1))/((m-1))*I_((n-2"," m-2))`

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