Surveyors, physicists, astronomers, construction people, chemists and other professions would use the trig functions outside of class. Burger flippers? Not so much.
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sine and cosine
cosine = adjacent/hypotenuse. It can be used as other trig functions can.
the interval between numbers in a sequence
Sides have lenght, angles do not. Cosine is the ratio of the adjacent side to the hypotenuse. Cosine can be used to find either of these sides if the other is known.
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