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If int(0)^(oo)(x^(2)dx)/((x^(2)+a^(2))(x...

If `int_(0)^(oo)(x^(2)dx)/((x^(2)+a^(2))(x^(2)+b^(2))(x^(2)+c^(2)))=(pi)/(2(a+b)(b+c)(c+a))" then "int_(0)^(oo)(dx)/((x^(2)+4)(x^(2)+9))=`

A

`pi//60`

B

`pi//20`

C

`pi//40`

D

`pi//80`

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