Question

2cos(5x-π/4)=1
Решите уравнение

Answer 1

Ответ:

$\cos((5x - \frac{\pi}{4} ) = \frac{1}{2} \\ 5x - \frac{\pi}{4} = + - \frac{\pi}{3} + 2\pi \times k \\ x = + - \frac{\pi}{15} + \frac{\pi}{20} + \frac{2\pi \times k}{5}$