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OpenStudy (anonymous):
use the coterminal angle to find the exact value of the expression: cos 420 how do you do this? please help!
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OpenStudy (anonymous):
cos 420 will be the same value as cos 60 since we're dealing with a 360 degree circle. cos 60 is 1/2 due to the unit circle.
OpenStudy (anonymous):
so would it be 420-360 that equals 60?
OpenStudy (anonymous):
Exactly.
OpenStudy (anonymous):
thank you!
OpenStudy (anonymous):
also, the next part of the question is if coterminal = 60 degreees. then what does cos 420 equal?
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