`cos1^(@)cos2^(@)cos3^(@)* * * cos 120^(@)` =________.

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cos1^(@)+cos2^(@)+cos3^(@)+.......+cos180^(@) =

cos1^(@)+cos2^(@)cos3^(@)...+cos179^(@)" is "

cos 1^(@)cos2^(@) cos3^(@) ..... cos 180^(@) .......

What is the value of cos1^(@) cos2^(@)cos3^(@).....cos270^(@) ?

The value of cos1^(@)cos2^(@)cos3^(@)…cos180^(@) is

cos 1^(@) + cos2^(@) + cos 3^(@) + ….+cos 180^(@) is equal to