Let 'f' be differentiable at c. Let y = ax + b be the equation of the tangent line to the graph of 'f' at point [c,f(c)]. Prove that
Lim F(x) - (ax + b) = 0
x->c x - c

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whats with the x-c on the bottom there

Treat that limit as a fraction
i.e x -c is the denominator

is f and F the same function in the question

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