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\text { Consider the function } f(x)=x^{2}-4 x \text {. } (a) Find the derivative f'(x) of the function, using the definition of the derivative. (b) Find the equation of

the tangent line to the curve of y = f(x) at the point(-1,5). (c) Find the values of x for which the tangent line is horizontal.nointo

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