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Mathematics 14 Online
geerky42 (geerky42):

How to find the exact value of \(\cos\left(\dfrac{\pi}{7}\right)\)?

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

geerky42 (geerky42):

@Ephilo How?

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