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Q.

The partial fractions of x2(x2+a2)(x2+b2)  are

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a

1a2+b2[a2x2+a2b2x2+b2]

b

1a2b2[1x2+a21x2+b2]

c

1b2a2[a2x2+a2b2x2+b2]

d

1a2b2[a2x2+a2b2x2+b2]

answer is C.

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Detailed Solution

x2(x2+a2)(x2+b2)=Ax+Bx2+a2+Cx+Dx2+b2

x2=(Ax+B)(x2+b2)+(Cx+D)(x2+a2)

A+C=0(1);B+D=1(2);Ab2+Ca2=0(3); Bb2+Da2=0(4)

From (1) and (3)

A=0,C=0

From (2) and (4)

B=a2a2b2;D=b2a2b2

a2(a2b2)(x2+a2)b2(a2b2)(x2+b2)

1(a2b2)[a2x2+a2b2x2+b2]

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