∫x4+1×6+1dx is equal to

x4+1x6+1dx is equal to

  1. A

    tan1x+13tan1x3+C

  2. B

    tan1x-13tan1x3+C

  3. C

    tan1x13tan1x3+C

  4. D

    none of these

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    Solution:

    Let

    I=x4+1x6+1dx=x4x2+1+x2x6+1dx I=x4x2+1x23+1dx+x2x6+1dx I=1x2+1dx+131x32+1dx3 I=tan1x+13tan1x3+C

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