Use an appropriate sine or cosine integral to represent the function f(x) = 2x, |x| < 3π 0, |x| > 3π
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Represent the given function by an appropriate cosine or sine integral. $$ f(x)=\left\{\begin{array}{ll} x, & |x|<\pi \\ 0, & |x|>\pi \end{array}\right. $$
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