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    Derivative of functions by first principles

    find the derivative of the following functions from 1st principles
    1) f(x)= -2x^3
    f'(x)=lim[h:0,(f(x+h)-F(x))/h]
    f(x)=-2x^3;f(x+h)=-2(x+h)^3
    f'(x)=lim[h:0,(-2(x+h)^3-2x^3)/h]
    ...
  2. my bad

    oh my bad sry nw read the part abt homework, im getting stuck at lim h:0 (-4x^3-6x^2h-6xh^2-2h3)/h
    how do i cancel the h??
  3. Heeeeeeeeeeeeeeeeeeeeeeelllllllllllppppppppppppppp pppppppppppppp

    find the derivative of the following functions from 1st principles 1) f(x)= -2x^3

    2)f(x)=3sqrt[x]

    3)f(x)=(x+1)^2
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