Determine whether each of the following functions are even, odd, or neither. Please state the symmetry.

a)f(x)=1 / (x^2+1) b)g(x)=x^2 / (1+x^4) c)h(x)= (2x^4) + (3x^2)

d)f(x)={1 / (x^3+x)}^5 e)g(x)=x+(1/x) f)h(x)=x-(x^2)

g)f(x)=2^x h)g(x)=(logx^2) / (log3x^4)

For each of the above functions from a) through h) how do you determine if it is even,odd,or neither??