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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
​

User Orin MacGregor
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Sorry if it is not clear enough

How prove the following cos²(120°-A) + cos²A + cos²(120°+A)= 3/2 ​-example-1
User Yogeshagr
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