f(x)=ln(1/x^2)
f(x)=3x^3+2x^2
f(x)=x^3/3
f(x)=2x+2
f(x)=(x^2+1)^(1/2)
f(x)=tan(x^2)
f(x)=0.5x^(1/2)
f(x)=ln(2x+1)
f(x)=(9x^2+3x+2)^4
(x^2++2z+3)/x^2
f(x)=1/x
f(x)=sin(cos(x))
