Question

Решить уравнение cos3x/4=-1/2

Answer 1

3x/4=+-3π/4+2πn
x=+-π+8πn/3,n∈z

Answer 2

$cos\frac{ 3x}{4} = - \frac{1}{2}$
$\frac{3x}{4}=б\frac{2}{3}\pi+2\pi k,$
$x=\frac{4}{3}*(б<span>\frac{2}{3}\pi</span>+2\pi k),$
$x=б\frac{8}{9}\pi+\frac{8}{3}\pi k,$