find the value of cos A + cos(120+A)+ cos (120-A)
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Answer:
Cos A = 0
Step-by-step explanation:
Cos A + Cos ( 120 + A ) + Cos ( 120 - A )
= Cos A + Cos 120 + Cos A + Cos 120 - Cos A
= Cos A [ 1 + 2 × ( -½ ) ]
= 0
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