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Find A if 2 cos 3A = 1​

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\\ \large :\implies\sf2 \cos3A = 1 \\ \\\large :\implies\sf\cos3A = \frac{1}{2} \\ \\\large :\implies\sf \cos3A = \cos60 \degree\\ \\\large :\implies\sf3A = 60 \\ \\\large :\implies\sf A = \frac{60}{3} \\ \\\large :\implies \boxed{\sf A = 20}


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