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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 (anonymous):
periodic means that the values actually repeat themselves every period. (bad definition on my part lol) but, cos(420) = cos(420-360) = cos(60)
OpenStudy (anonymous):
how did you got 360
OpenStudy (anonymous):
@alexandercpark how did you got 360
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