int0^a x^4/(a^2+x^2)^4 dx...

`int_0^a x^4/(a^2+x^2)^4 dx`

A

(a) `1/(16a^(3))((pi)/4-1/3)`

B

(b) `1/(16a^(3))((pi)/4+1/3)`

C

(c) `1/16a^(3)((pi)/4-1/3)`

D

(d) `1/16a^(3)((pi)/4+1/3)`

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The correct Answer is:

A

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