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If f(x) is an even function then int(-pi...

If f(x) is an even function then `int_(-pi)^(pi)f(x)sinnxdx=`

A

0

B

`2int_(0)^(pi)f(x)sinnxdx`

C

`4int_(0)pi//2f(x)sinnxdx`

D

none

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