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OpenStudy (anonymous):
I NEED HELP. use the fact that the trigonometric functions are periodic to find the exact value of each expression. cos 420°
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OpenStudy (lgbasallote):
periodic means you can subtract 360 from 420
OpenStudy (lgbasallote):
and still get the same value
OpenStudy (lgbasallote):
so what's 420 - 360?
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