The 3 most common trigonometry functions are as follows:
An easier way to remember these is SOH-CAH-TOA which, when pronounced out-loud, sounds kind of like "soak a toe".
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The six basic functions of trigonometry are the sine, cosine, tangent, cosecant, secant, and cotangent functions. Abbreviated sin, cos, tan, csc, sec, cot.
In geometry, similar shapes have the same angles. This means that the values of the basic trigonometric functions of these angles are the same.
The basic principle of trigonometry is that there are mathematical relationships between the sides and angles of a triangle.
Not specifically trigonometry, but functions in general. As a general rule, functions must be evaluated before using the results in other parts of the calcuation.
Trigonometry functions are used to work out the various properties of triangles.