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cos ^(2) alpha + cos ^(2) (alpha + 120^(...

`cos ^(2) alpha + cos ^(2) (alpha + 120^(@)) + cos ^(2) (alpha - 120^(@))` is equal to

A

`3/2`

B

`1`

C

`1/2`

D

`0`

Text Solution

Verified by Experts

The correct Answer is:
B
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