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If `int(1)/((x^(2)+4)(x^(2)+9))dx=A" tan"^(-1)(x)/(2)+Btan^(-1)((x)/(3))+C`, then A-B=

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If `int(1)/((x^(2)+4)(x^(2)+9))dx=A" tan"^(-1)(x)/(2)+Btan^(-1)((x)/(3))+C`, then A-B=
A. `(1)/(6)`
B. `(1)/(30)`
C. `(-1)/(30)`
D. `(-1)/(6)`
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Correct Answer - A
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