Question

sinx/2-11cosx/4=0 Помогите пожалуйста!

Answer 1

$\sin( \frac{x}{2} ) - 11 \cos( \frac{x}{4} ) = 0 \\ 2 \sin( \frac{x}{4} ) \cos( \frac{x}{4} ) - 11 \cos( \frac{x}{4} ) = 0 \\ \cos( \frac{x}{4} ) \times (2 \sin( \frac{x}{4} - 11 ) = 0 \\ \cos( \frac{x}{4} ) = 0 \\ 2 \sin( \frac{x}{4} ) - 11 = 0 \\ x = 2\pi + 4n\pi$