گرافی فانکشن

${\displaystyle f(x)=x^{3}-9x\,}$

${\displaystyle \{(x,x^{3}-9x):x{\text{ is a real number}}\}.\,}$

${\displaystyle f(x,y)=sin(x^{2})\,cos(y^{2})}$ ،

${\displaystyle f(x,y)=-(\cos(x^{2})+\cos(y^{2}))^{2}\,}$