Question

2cos3theta=1

they a =??​

Answer 1

Step-by-step explanation:

hey mate here is your answer .................

Answer 2

$given \\ 2 \cos(3 \alpha ) = 1 \\ \cos(3 \alpha ) = \frac{1}{2} \\ 3 \alpha = { \cos }^{ - } \cos( \frac{\pi}{3} ) \\ 3 \alpha = \frac{\pi}{3} \\ \alpha = \frac{\pi}{9}$