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  • 5 years ago

find the exact answer(no calculators). cos(3pi/8)

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  1. anonymous
    • 5 years ago
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    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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