Question

prove that cosA + cos (A + 2pi/3)+ cos (A - 2pi/3) =0​

Answer 1

Answer:

cos 2pi/3 = ‑1/2 as we know. so cos inverse cos 2pi by 3 = cos inverse ‑1/2. cos inverse range is from 0 to pi so answer is 2pi/ 3 itself

2 months ago

Step-by-step explanation:

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Answer 2

Answer:

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