Question

prove that cos square x + cos square x + pi by 3 + cos square x minus pi by 3 equal to 3 by 2​

Answer 1

Answer:

let's first calculate all 3 terms separately

we know that

cos 2x=2cos²x-1

cos2x+1=cos²x

cos2x+1 /2=cos²x

So,cos²x = cos²x+1/2

Replacing x with (x+r/3) is about

Explanation:

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