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OpenStudy (anonymous):
the exact value of cos2 π/8 is? a) radical 3/2 b) - radical 3 / 2 c) 1/2 d) -1/2
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OpenStudy (rulnick):
Is that cos^2?
OpenStudy (rulnick):
Otherwise, if it's cos(2pi/8), it's sqrt(2)/2, which isn't one of the choices.
OpenStudy (anonymous):
no it's not cos^2
OpenStudy (anonymous):
don't I need to do 2pi/3 time 180/pi?
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