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x111+x212dx is equal to 

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a
−161x4+132+101x4+152+C
b
−161x4+1−32+1101x4+152+C
c
161x4+132−1101x4+152+C
d
161x4+132+1101x4+152+C

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detailed solution

Correct option is C

∫x−111+x412dx=∫1+x4x11dx=∫x21+1x4x11dx=∫1+1x4x9dx=∫1+1x4x4x5dx Put 1+1x4=t2−4x5dx=2tdtdxx5=−24tdt=∫tt2−1−12tdt=−12∫t2t2−1dt=−12∫t4−t2dt=−12t55−t33+C=161x4+132−1101x4+152+C


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