geerky42
How to find the exact value of \(\cos\left(\dfrac{\pi}{7}\right)\)?



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RadEn
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pi/7 ?

geerky42
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Yes.

geerky42
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Is it possible to find the exactly value algebraically?

starbot
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yes it is possible but I'm not quite sure how

Ephilo
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try using the half angle formula

geerky42
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@Ephilo How?