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Question

Given that 0x2(x2+a2)(x2+b2)(x2+c2)dx=π2(a+b)(b+c)(c+a), the value of 0dx(x2+4)(x2+9) is

A
π60
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B
π20
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C
π40
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D
π80
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Solution

The correct option is A π60
Given,0x2(x2+a2)(x2+b2)(x2+c2)dx=π2(a+b)(b+c)(c+a).....(1)Now,0dx(x2+4)(x2+9)Multiplyanddivideaboveequationbyx2weget0x2dx(x2+4)(x2+9)(x2).....(2)Comparingequation(1)and(2)wegeta2=4;b2=9;c2=0ora=2;b=3;c=0Hence,0x2dx(x2+4)(x2+9)(x2)=π2(2+3)(3+0)(0+2)=π2×5×3×20x2dx(x2+4)(x2+9)(x2)=π60

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