$\lim_{x\to9}\left(\frac{\sqrt{x-2}}{x-4}\right)$
$81-36x^{3}+4x^{6}$
$8+x<-2$
$2x\left(x+3\right)-3\left(4x-1\right)+\left(x+1\right)^2$
$y^{\left(-3\right)}x^{\left(6\right)}+y^{\left(6\right)}x^{\left(-3\right)}=2x+1$
$-7u+-4u+u$
$\frac{4}{3}\pi\cdot10.5^2$
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