Find the value of cos/7cos2/7cos3/7

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{cos}^{- 1} cos \frac{7 π}{6} .

cos \frac{3 π}{7} - cos \frac{2 π}{7} + cos \frac{π}{7} = \frac{1}{m}

m

c o s^{- 1} (c o s \frac{7 π}{6})

2 {cos}^{3} \frac{π}{7} - {cos}^{2} \frac{π}{7} - cos \frac{π}{7}

= \frac{1}{b}

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

= - \frac{1}{a}

a .

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