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प्रश्न
Evaluate : `intsec^nxtanxdx`
उत्तर
`I=intsec^(n-1)xsecxtanx dx`
Let secx=t
`therefore secxtanx dx=dt`
`I=intt^(n-1)dt`
`=t^n/n+c`
`=sec^nx/n+C`
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