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anonymous
 5 years ago
find the exact answer(no calculators).
cos(3pi/8)
anonymous
 5 years ago
find the exact answer(no calculators). cos(3pi/8)

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the 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 cosacosbsinasinb.... 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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