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'''Tangent''' is a [[trigonometry|trigonometric]] function.
In [[trigonometry]], the '''tangent''' is defined as a relationship between the [[sine]] and [[cosine]] functions:
<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.
[[Category:Mathematics]]
[[Category:Mathematics]]