Mathematics

Solve the following equations for A, if :
2 cos 2 A = 1

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2 cos 2 A = 1

⇒ cos 2A = $\dfrac{1}{2}$

⇒ cos 2A = cos 60°

So, 2A = 60°

⇒ A = $\dfrac{60°}{2}$

⇒ A = 30°

Hence, A = 30°.

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