y=5x^4+3x + 7
y'=20x^3+3
y= 3/x- 2Vx+7
y'=3/x^2-2*1/2x^1/2=3/x^2-x^1/2=3/x^2- Vx
y=(4x-1)^3
y'=3(4x-1) ^2*4=12(4x-1) ^2
y=V2x^3+3
y'=1/2(2x^3+3) *6x^2=3x^2(2x^3+3)
2) y=(1+4x)/(1+2x)
y'=4/(2x+1) -(2(4x+1)/(2x+1)^2
x=1
4/3-(2*5)/9=4/3-10/9=2/9
x=0
4-2/1 =2
y=3cos2x
y'=-6sin2x
x=pi/4
y'(pi/4) =-6 sin(pi/2)=-6