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geerky42 (geerky42):
How to find the exact value of \(\cos\left(\dfrac{\pi}{7}\right)\)?
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OpenStudy (raden):
pi/7 ?
geerky42 (geerky42):
Yes.
geerky42 (geerky42):
Is it possible to find the exactly value algebraically?
OpenStudy (anonymous):
yes it is possible but I'm not quite sure how
OpenStudy (anonymous):
try using the half angle formula
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geerky42 (geerky42):
@Ephilo How?
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