Trigonometry - (Sine|Sinus)
About
Sine is the function of an angle (trigonometric function).
The word comes from the Latin sinus for gulf or bay, since, given a unit circle, it is the side of the triangle on which the angle opens.
Articles Related
Periodic
Derivative
For the sine function: <MATH> f(x) = \sin x </MATH> The derivative is the cosine: <MATH> f'(x) = \cos x </MATH>