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OpenStudy (anonymous):
How do you use the half angle identity for cos (-pi/8) ?
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pooja195 (pooja195):
Cos(Pi/8)=[(1+Cos{Pi/4})/2]^1/2 Cos(Pi/4)=SQRT2/2=.707 Therefore Cos(Pi/8)=[(1+.707)/2]^1/2=.924
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