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OpenStudy (elleblythe):
How to find the exact value of cos(13pi/8)??
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OpenStudy (anonymous):
half angle formula for this one
OpenStudy (anonymous):
\[\frac{13\pi}{8}\] is half of \(\frac{13\pi}{4}\)
OpenStudy (anonymous):
you good from there?
OpenStudy (elleblythe):
@satellite73 I was looking at the solution in my notes and it says it becomes sin(pi/8) at one point, how does that happen?
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