If \[f(x)\] is an even function, then what is \[\int\limits_{0}^{\pi }{f(\cos x)dx}\] equal to?

\[\int\limits_{0}^{\frac{\pi }{2}}{f(\cos x)dx}\]

\[2\int\limits_{0}^{\frac{\pi }{2}}{f(\cos x)dx}\]

If \[f(x)\] is an even function, then what is \[\int\limits_{0}^{\pi }

1.	If \[f(x)\] is an even function, then what is \[\int\limits_{0}^{\pi }{f(\cos x)dx}\] equal to?
A.	0
B.	\[\int\limits_{0}^{\frac{\pi }{2}}{f(\cos x)dx}\]
C.	\[2\int\limits_{0}^{\frac{\pi }{2}}{f(\cos x)dx}\]
D.	1
Answer» D. 1

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If \[f(x)\] is an even function, then what is \[\int\limits_{0}^{\pi }{f(\cos x)dx}\] equal to?

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