Question

solve this..........​

Answer 1

Answer:

cosα + [cos(120-α) + cos(120+α)]

cosα + cos(120 -α+ 120 +α/2) + cos(120-α-120-α/2)

cosα + cos(240/2) + cos(-2α/2)

cosα + cos 120 + cos(-α)

cosα + cos(90*2 - 60) - cosα

-cos 60

- 1/2

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