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OpenStudy (anonymous):
find the exact value cos(7pi/8) the answer from the exam review shows the following... -sqrt(2-sqrt(2)/4)
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OpenStudy (solomonzelman):
pi is 180, so (7/8) * 180.
OpenStudy (solomonzelman):
157.5
OpenStudy (solomonzelman):
Find the cosine of that.
OpenStudy (anonymous):
wouldnt use the addtion or subtraction cos formula? Made a error it should say "Find the exact solution"
OpenStudy (solomonzelman):
|dw:1383695282299:dw|
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