Equation of tangent to a curve

Rarely Tested
Slope: $$m = \left. \frac{dy}{dx} \right|_{(x_0,y_0)}$$
Equation: $$y - y_0 = m (x - x_0)$$
Equation of the tangent line to curve $$y=f(x)$$ at point $$(x_0, y_0)$$.
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