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    $\int \frac{xcosx-sinx}{x^{2}+sin^{2}x}dx$

    $=\int \frac{xcosx-sinx}{x^{2}+sin^{2}x}.\frac{csc^{2}x}{csc^{2}x}dx$

    $=\int \frac{xcotxcscx-cscx}{x^{2}csc^{2}x+1}dx=-tan^{-1}(xcscx)+c$
    ; 06-30-2016 09:29 AM

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    2) [0,1] 1
    ; 06-30-2016 03:14 PM

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    ; 06-30-2016 06:45 PM

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    wolfram alpha
    ; 06-30-2016 11:00 PM

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    ( ) .......

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