Тригонометрические неравенства:
1) [tex]cosx\ \textgreater \ \frac{ \sqrt{2} }{2} [/tex]
2) [tex]cosx\ \textless \ - \frac{ \sqrt{2} }{2}[/tex]
3) [tex]cosx \geq \frac{ \sqrt{3} }{2}[/tex]
4) [tex]cosx \leq - \frac{ \sqrt{3} }{2}[/tex]

Желательно с графиком, если не составит труда.
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