Equation of the tangent line


Use the f'(x)= lim (h-0) f(x + h) - f(x)/h to find f'(x). b-) Find the domain of f'. c) Find and equation of the tangent line to the graph of f at P. d) Find the points on the graph a which the tangent line is horizontal.

f(x) = x^3 + x ; [1,2]

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Mathematics: Equation of the tangent line
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