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If `f(x)` is a function satisfying `f(1/x)+x^(2)f(x)=0` for all non zero `x` then `int_(cos theta)^(sec theta)f(x)dx=`

A

`sin 2 theta`

B

`1`

C

`sec theta - cos theta`

D

`0`

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The correct Answer is:
D
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