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[" Example: "5" If "f(x)=cos[pi^(2)]x+co...

[" Example: "5" If "f(x)=cos[pi^(2)]x+cos[-pi^(2)]x," then "],[[" (a) "f((pi)/(4))=2," (b) "f(-pi)=2," (c) "f(pi)]]

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