Changes

<math>\tan \theta = \frac{\sin \theta}{\cos \theta} = \cot \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\cot \theta} \,</math>

<math>\tan \theta = \frac{\sin \theta}{\cos \theta} = \cot \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\cot \theta} \,</math>

Lines which intersect a [[circle]] or [[curve]] at only one, unique point are said to be tangent to that circle or curve.

In [[analytic geometry]], a line which intersect a [[circle]] or [[curve]] at only one, unique point is said to be tangent to that circle or curve. At their point of intersection, the curve and the line have exactly the same [[slope]].

 

[[Category:Mathematics]]

[[Category:Mathematics]]