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Mathematics 14 Online
OpenStudy (anonymous):

evaluate cos((15pi)/4) using its period as an aid. I'm stumped... It has been five years since my last trig class...

OpenStudy (anonymous):

you basicly just look at the unit circle and use pi/4 as your reference point and keep going around the circle evaluating all the pi/4 reference points until you get to 15pi/4...if that makes since

OpenStudy (anonymous):

thank you so much you god among men

OpenStudy (anonymous):

lol you welcome

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