Question

Find A if 2 cos 3A = 1​

Answer 1

$\huge \underline{ \bf { \red S \green O \pink L \blue U \orange T \purple I \red O \pink N \green{...}}}$

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