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∫exlog(sinex)tanex dx

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प्रश्न

`int ("e"^xlog(sin"e"^x))/(tan"e"^x)  "d"x`

योग
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उत्तर

Let I = `int ("e"^x*log(sin"e"^x))/(tan("e"^x))  "d"x`

= `int"e"^x*log(sin"e"^x)*cot("e"^x)  "d"x`

Put log(sin ex) = t

Differentiating w.r.t. x, we get

`(cos"e"^x)/(sin "e"^x) * "e"^x  "d"x` = dt

∴ `"e"^x * cot "e"^x  "d"x` = dt

∴ I = `int "t"* "dt" = "t"^2/2 + "c"`

∴ I = `([log(sin "e"^x)]^2)/2 + "c"`

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अध्याय 2.3: Indefinite Integration - Short Answers I

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