Prove that: `inttan^n xdx=1/(n-1)tan^(n-1)x-inttan^(n-2)xdx`

Explanation

Given,

`int tan^nxdx`

`=int tan^(n−2)x(tan^2x)dx`

`=int tan^(n−2)x(sec^2x)dx−int tan^(n−2)xdx`



Let,

`tanx=t`

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