Задание на картинке
Варианты ответов :
[tex]y=cos (x- \frac{ \pi }{6} ) ;

y=cos (x+ \frac{ \pi }{4} ) ;

y=cos (x+ \frac{ \pi }{6} ) ;

y=cos (x- \frac{ \pi }{4} ) ;[/tex]
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