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OpenStudy (anonymous):
find the exact answer(no calculators). cos(3pi/8)
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OpenStudy (anonymous):
the way i would handle it is by splitting up 3pi/8 into two numbers on the unit circle, and then using the formula for cos(a+b) which is cosacosb-sinasinb.... but i can't seem to split up 3pi/8 into two things on the unit circle.. this probably makes no sense.
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