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What is the value of this?? plz guys hlp me wid this!!!

Answer»
\cos( \frac{\pi}{3} ) = \cos(60) = \frac{1}{2} \\ \\ { \cos}^{2} \frac{\pi}{3} = \frac{1}{4}
\\ \\ \\ \cos( \frac{\pi}{4} ) = \cos(45) = \frac{1}{ \sqrt{2} } \\ { \cos }^{2} \frac{\pi}{4} = \frac{1}{2}
\\ \\ \\ \\ \cos( \frac{\pi}{6} ) = \cos(30) = \frac{ \sqrt{3} }{2} \\ { \cos }^{2} \frac{\pi}{6} = \frac{3}{4}
HENCE RATIO is


1:2:3


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