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Q.

Evaluate ∫x2+4x4+16dx

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a

122tan−1⁡x2−4x2+C

b

122tan−1⁡x−42x2+C

c

122tan−1⁡x2−422+C

d

122tan−1⁡x2−42x2+C

answer is D.

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Detailed Solution

I=∫x2+4x4+16dx=∫1+4x2x2+16x2dx=∫1+4x2x2+4x2−8+8dx=∫1+4x2x−4x2+8dx Let x−4x=t . Then dx−4x=dt or 1+4x2dx=dt ∴ I=∫dtt2+(22)2=122tan−1⁡t22+C=122tan−1⁡x−4x22+C=122tan−1⁡x2−42x2+C
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