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Ifint0^oo(x^2dx)/((x^2+a^2)(x^2+b^2)(x^2...

`Ifint_0^oo(x^2dx)/((x^2+a^2)(x^2+b^2)(x^2+c^2))` `=pi/(2(a+b)(b+c)(c+a))` then the value of `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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