Consider the following three functions:
Which of them is a) An even function, b) AN odd function and c) neither an even or odd function?
1) Even. "(-x)^2=x^2"
2) Odd. "(-x)cos(-x)=-xcosx"
3) Neither. "e^{-x}\\ne e^x,\\;e^{-x}\\ne -e^x"
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