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    Pariah :Care:y Plug Drugs's Avatar
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    Here.. pretty basic calculus problem. If you want to find the slope of the tangent line at a point on the curve y=x^2, we can pretend the tangent line touches two points on the curve an infinitesimal distance apart.

    Slope = Rise / Run
    the 'run' is infinitesimal, which we will represent with the variable 'h'

    Rise = (x+h)^2 - x^2


    x^2 + h^2 + 2xh + -x^2

    h


    simplify this to 2x+h or just 2x, which is the derivative of y=x^2, giving us the slope of the tangent line at any given point on the curve y=x^2
    Last edited by Plug Drugs; 01-17-2016 at 12:51 AM.
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