Question

Решите уравнение
$4 \sin(3x - 11\pi \div 2) = 3$

Answer 1

$\sin(3x) \cos( \frac{11\pi}{2} ) - \cos(3x) \sin( \frac{11\pi}{2} ) = \frac{3}{4} \\ \cos(3x) = \frac{3}{4} \\ 3x = arccos( \frac{3}{4} ) \\ x = \frac{arccos( \frac{3}{4}) }{3}$