# Trigonometry - Function

Trigonometric functions are function of an angle.

Trigonometric functions are important in the modeling of periodic phenomena.

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## Documentation / Reference

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Statistics - (Periodicity|Periodic phenomena|Cycle)

Periodic phenomena such as: sound and light waves, the position and velocity of harmonic oscillators, sunlight intensity and day length, and average temperature variations throughout the year....
Trigonometry - (Cosine|Cosinus)

Cosine is the function of an angle (trigonometric function) For the cosine function: The derivative is the sine:
Trigonometry - (Sine|Sinus)

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. ...
Trigonometry - Fourier (Analysis|Synthesis)

Fourier analysis is the study of the way general functions may be represented or approximated by sums of simpler trigonometric functions. In the sciences and engineering,: the process of decomposing...