sin A=opposite/hypotenuse
cos A=adjacent/hypotenuse
tan A=opposite/adjacent
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We will have to modify/extend these definitions slightly to generalize them
for angles greater than 90° and less than 0°
Some authors refer to these generalized definitions as
circular functions. We will continue to call either trigonometric functions.
The trig functions are part of a general class of functions termed
periodicthey repeat. That is, the dependent variable takes on the
same set of values over and over again.