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Mathematics 7 Online
OpenStudy (anonymous):

Find the exact value of the trigonometric function. (If an answer is undefined, enter UNDEFINED.) cos 390°

jimthompson5910 (jim_thompson5910):

you can type in cos(390) into your calculator alternatively, you can type in cos(30) because 390-360 = 30 is your reference angle (the angle is in quadrant 1)

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