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Which of the following function is (are)...

Which of the following function is (are) even, odd, or neither? (a). `f(x)=x^2sinx` (b). `f(x)=log((1-x)/(1+x))` (c). `f(x)=log(x+sqrt(1+x^2))` (d). `f(x)=(e^x+e^(-x))/2`

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