Mathematics, 09.08.2021 09:30 jaubrey20

How prove the following
cos²(120°-A) + cos²A + cos²(120°+A)= 3/2

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How prove the following
cos²(120°-A) + cos²A + cos²(120°+A)= 3/2
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How prove the following cos²(120°-A) + cos²A + cos²(120°+A)= 3/2​

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How prove the following
cos²(120°-A) + cos²A + cos²(120°+A)= 3/2