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Question

Solve:

1+x+x+x2x+1+xdx is equal to

A
121+xC
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B
23(1+x)3/2+C
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C
1+x+C
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D
32(1+x)32+C
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Solution

The correct option is B 23(1+x)3/2+C
(1+x)+x+x2x+1+xdx
=(1+x)+x(1+x)x+1+x×(x1+x)(x1+x)dx
=(1+x)+x(1+x)(x(1+x))(x1+x)dx
=x(1+x)1+x(1+x)+x1+xx(1+x)(1)dx
=1+x(x1x)(1)dx
=1+xdx
=2(x+1)323+C
(1+x)+x+x2x+1+xdx=2(x+1)323+C.

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