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Question

x44x24+x2+x4dx

A
4+x2+x4x+c
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B
4+x2+x4+c
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C
4+x2+x42+c
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D
4+x2+x42x+c
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Solution

The correct option is B 4+x2+x4x+c
I=x44x34x2+1+x2dx=x4x34x2+1+x2dx

Substitute t=4x2+1+x2dt=2(x4x3)dx
I=12t1/2dt=t+c
I=4x2+1+x2+c=4+x2+x4x+c

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