Soh Cah Toa.............

sine

sīn/

noun

MATHEMATICS

1. the trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.

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Sine - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Sine

Wikipedia

The sine of an angle is defined in the context of a right triangle: for the specified angle, it is the ratio of the length of the side that is opposite that angle (that is not the hypotenuse) to the length of the longest side of the triangle (i.e., the hypotenuse).

At zero‎: ‎0

Parity‎: ‎odd

Period‎: ‎2π

Fixed point‎: ‎0

Sine -- from Wolfram MathWorld

mathworld.wolfram.com › ... › Trigonometric Functions

MathWorld

by EW Weisstein - ‎2002 - ‎Related articles

A convenient mnemonic for remembering the definition of the sine, as well as the cosine and tangent, is SOHCAHTOA (sine equals opposite over hypotenuse, ...

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The Sine and Cosine Functions - Overview - Math

math2.org/math/algebra/functions/sincos/

The sine (abbreviated "sin") and cosine ("cos") are the two most prominent trigonometric functions. All other trig functions can be expressed in terms of them. In fact, the sine and cosine functions are closely related and can be expressed in terms of each other.