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cos 12^@+ cos60^@ +cos 84^@ = cos24^@ + ...

`cos 12^@+ cos60^@ +cos 84^@ = cos24^@ + cos 48^@`. mverify by a graph.

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cos12^(@)+cos60^(@)+cos84^(@)=cos24^(@)+cos48. mverify by a graph.

cos12^(@)+cos60^(@)+cos84^(@)=cos24^(@)+cos48

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

cos12^@ cos24^@ cos36^@ cos 48^@ cos 72^@ cos 84^@ is equal to:

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

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