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#1 Re: Help Me ! » tangent plane to a curve » 2008-10-06 23:43:36

Differentiate the function explicitly with respect to x and make dy/dx subject of the formula,after that substitute the values of x,y,z, i.e(1,2,3) into the equation.What you get is call the gradient if the function.Equate the value you got to this, (y1-y)/(x1-x)  and cross multiply to get the equation.

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