Question

cos 2q can not be equal to​

Answer 1

Answer:

Cos (2x)= 2(cosx)^2–1.

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Answer 2

Answer:

Explanation:

Cos2x is a double angle trigonometry that has the espansion of cos2x = cos^2(x) -sin^2(x) but you know that sin^2(x) + cos^2(x) = 1.

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