[tex]y=f(x-n)[/tex] is a translation to the right (along the x-axis) by 'n' units
[tex]y=f(nx)[/tex] is a stretch horizontally by scale factor 1/n
[tex]y=nf(x)[/tex] is a stretch vertically by scale factor of n
So [tex]y=3cos(10(x- \pi ))[/tex] is a translation of [tex]y=cos(x)[/tex] by [tex] \pi [/tex] to the right, and then stretched on the x-axis by scale factor [tex] \frac{1}{10} [/tex] and lastly stretched on the y-axis by scale factor of [tex]3[/tex]
