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cos 12^@ + cos 84^@ + cos 132^(@) + cos ...

`cos 12^@ + cos 84^@ + cos 132^(@) + cos 156^(@)=`

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4 cos 12 ^(@) cos 48^(@) cos 72^(@) = cos 36 ^(@)

cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@)=

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cos 12 ^(@) cos 24 ^(@) cos 36 ^(@) cos 48^(@) cos 72^(@) cos 84^(@) = (1)/(2 ^(6))

Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)

Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)

Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)