4/ 2/Vx
5/ d/dx(5 x^3+3 x^2-8 x+7) = 15 x^2+6 x-8
6/ d/dx((2 x-3) (3 x+2)) = 3 (2 x-3)+2 (3 x+2)
7/ d/dx(1/(9 x-2)) = -9/(9 x-2)^2
8/ d/dx((3 x+2)/(x^3+1)) = 3/(x^3+1)-(3 x^2 (3 x+2))/(x^3+1)^2
9/ d/dx(1/4 (x^3-2 x+7)) = 1/4 (3 x^2-2)
10/ d/dx((4 x+3)^4) = 16 (4 x+3)^3
11/ d/dx(2/sqrt(x)) = -1/x^(3/2)