`sin 21^(@) cos 9^(@) - cos 84^(@) cos 6^(@)=`

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sin21^(@)cos9^(@)-cos84^(@) cos6^(@)=

Prove that sin21^(@)cos9^(@)-cos84^(@)cos6^(@)=1/4 .

cos 9^(@) - sin 9^(@)=

cos 66^(@) + sin 84^(@) =

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

"sin" 51^(@)+cos 81^(@)=cos 21^(@) .

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