Cos2-7-cos4-7-cos6-7 is equal to

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Irrational Numbers

cos2π/7+cos4π...

Question

$cos \frac{2 π}{7} + cos \frac{4 π}{7} + cos \frac{6 π}{7}$ is equal to

an integer

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a positive rational number

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a negative rational number

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an irrational number

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Solution

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Similar questions

1 + cos \frac{2 π}{7} + cos \frac{4 π}{7} + cos \frac{6 π}{7}

cos \frac{2 π}{7} + cos \frac{4 π}{7} + cos \frac{6 π}{7}

cos \frac{2 π}{7} + cos \frac{4 π}{7} + cos \frac{6 π}{7}

c o s \frac{2 π}{7} + c o s \frac{4 π}{7} + c o s \frac{6 π}{7} =

cos \frac{2 π}{7} + cos \frac{4 π}{7} + cos \frac{6 π}{7}

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