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If int(1)/((x^(2)+1)(x^(2)+4))dx=Atan^(...

If `int(1)/((x^(2)+1)(x^(2)+4))dx=Atan^(-1)x+B" tan"^(-1)(x)/(2)+C` , then

A

K = 2/3

B

L = 2/3

C

K = -2/3

D

L = -1/6.

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The correct Answer is:
D
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