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geerky42

  • 3 years ago

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

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  1. RadEn
    • 3 years ago
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    pi/7 ?

  2. geerky42
    • 3 years ago
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    Yes.

  3. geerky42
    • 3 years ago
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    Is it possible to find the exactly value algebraically?

  4. starbot
    • 3 years ago
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    yes it is possible but I'm not quite sure how

  5. Ephilo
    • 3 years ago
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    try using the half angle formula

  6. geerky42
    • 3 years ago
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    @Ephilo How?

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