[tex]1 - 2 \cos(x) > 0[/tex]
[tex] \cos(2x + \frac{\pi}{6} ) < 0.5[/tex]
[tex] \cos( \frac{\pi}{4} ) \times \cos(x) - \sin( \frac{\pi}{4} ) \times \sin < - \frac{ \sqrt{3} }{2} [/tex]
помогите please​