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cos (120^(@)) is -...

`cos (120^(@))` is -

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cos120^(@)=

cos120^o=

cos A + cos (120 ^ (@) + A) + cos (120 ^ (@) - A) =

cos A + cos (120 ^(@) - A ) + cos (120 ^(@) + A ) =0

cos theta + cos (120^(@) + theta ) + cos (120^(@) - theta )=

Prove that, cos alpha + cos(120^(@) + alpha) + cos (120^(@) - alpha) = 0

The period of cosx cos (120^(0) - x) cos (120^(0) + x) is

cos^(2) A + cos^(2) ( 120^(@) + A)+ cos^(2) (120^(@) - A )=

The minimum of cos^(2)(120^(@) + x)+ cos^(2) (120^(@) -x) is