Prove that  {cos}^{2} x + cos {}^{2} (x + \pi \div 3) + cos {}^{2} (x + \pi \div 3) = 3 \div 2

Question

Prove that

 {cos}^{2} x + cos {}^{2} (x + \pi \div 3) + cos {}^{2} (x + \pi \div 3) = 3 \div 2

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Kennedy 1 month 2021-09-21T22:40:14+00:00 1 Answer 0 views 0

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    2021-09-21T22:41:52+00:00

    Answer:

    I am really sorry i can not solve this question

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