\( f(x)=\int_{0}^{x} \cos ^{4} t d t \), then \( f(x+\pi) \) equals....

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\( f(x)=\int_{0}^{x} \cos ^{4} t d t \), then \( f(x+\pi) \) equals
\( \mathrm{P} \)
(1) \( f(x)+f(\pi) \)
(2) \( f(x)-f(\pi) \)
(2) \( \quad f(x) f(x) \)
(4) \( \frac{f(x)}{f(\pi)} \)



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