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If P=int0^oo(x^2)/(1+x^4)dx ; Q=int0^oo(...

If `P=int_0^oo(x^2)/(1+x^4)dx ; Q=int_0^oo(x dx)/(1+x^4)"and"R=int_0^oo(dx)/(1+x^4)`, then prove that :

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