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Question

a0x dxa2+x2=

A
a(21)
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B
a(12)
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C
a(1+2)
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D
2a3
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Solution

The correct option is A a(21)
Put t=a2+x22 xdx=dt, then
a0x dxa2+x2=122a2a21tdt
=[(2a2)12a22]=a(21)

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