The value of … is equal to :

Trigonometric Ratio and Identites

JEE Main 2022 · 27 Jun, Morning shift · Q5677

MathematicsMedium45×since 2004Q5677

The value of

\cos \left( {{{2\pi } \over 7}} \right) + \cos \left( {{{4\pi } \over 7}} \right) + \cos \left( {{{6\pi } \over 7}} \right)

is equal to :

JEE Main 2022 · 27 Jun, Morning shift · Q5677

MathematicsMedium45×since 2004Q5677

The value of

\cos \left( {{{2\pi } \over 7}} \right) + \cos \left( {{{4\pi } \over 7}} \right) + \cos \left( {{{6\pi } \over 7}} \right)

is equal to :