$\lim_{x\to3}\left(\frac{x^3+2x+4}{x^2-9}\right)$
$\:2x\:-\:5\:=\:23$
$\lim_{x\to\infty}\left(x\sqrt{x^2-19}-x\right)$
$\cos\:^{\left(2\right)}-\sin\:^{\left(2\right)}=1-2sin^{\left(2\right)}a$
$\frac{180}{12}$
$0-\left(-2\right)$
$f\left(x\right)=x^3+1$
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