[tex]y= 3 cos \frac{x}{3} \\y'= -3 (cos \frac{x}{3})'=-3sin\frac{x}{3}*(\frac{x}{3} )' =-3sin\frac{x}{3}*\frac{1}{3} =-sin\frac{x}{3} \\[/tex]
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[tex]y= 3 cos \frac{x}{3} \\y'= -3 (cos \frac{x}{3})'=-3sin\frac{x}{3}*(\frac{x}{3} )' =-3sin\frac{x}{3}*\frac{1}{3} =-sin\frac{x}{3} \\[/tex]