Angle Between Two Curves

Rarely Tested

Angle $$\phi$$ between curves $$y = f(x)$$ and $$y = g(x)$$ at intersection point:

$$\tan \phi = \left| \frac{m_1 - m_2}{1 + m_1 m_2} \right|$$

where $$m_1 = f'(x_0)$$, $$m_2 = g'(x_0)$$

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