f(x)=9x^3-8
f(x)=5x^2+6x+3
f(x)=2x-7
f(x)=-10
f(x)=3x^2+6x
f(x)=7x-2
f(x)=-2x-9
f(x)=8x^3+7x^2+8x-2
f(x)=6x-5
f(x)=9x^5+8x
f´(x)=6x+6
f´(x)=6
f(x)=27x^2
f´(x)=2
f´(x)=24x^2+14x+8
f´(x)=-2
f´(x)=10x+6
f´(x)=0
f´(x)=7
f´(x)=45x^4+8
