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Which of the following functions is (are...

Which of the following functions is (are) even, odd, or neither ?
(i) `f(x)=x^(2)sinx " (ii) " f(x)=sqrt(1+x+x^(2))-sqrt(1-x+x^(2)) `
(iii) `f(x)=log((1-x)/(1+x)) " (iv) " f(x)=log(x+sqrt(1+x^(2)))`
(v) `f(x)=sinx-cosx " (vi) " f(x)=(e^(x)+e^(-x))/(2)`

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