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'''Sine''' is a [[trigonometry|trigonometric]] function.
'''Sine''' is a [[trigonometry|trigonometric]] function describing the ratio between the opposite side and the hypotenuse in a right triangle.
A mathematical identity involving sine is:
<math>\sin \theta = \cos \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\csc \theta}\,</math>
<math>\sin \theta = \cos \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\csc \theta}\,</math>