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

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

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Find the value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) .

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The value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) is

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