$-6r^4t^2+9r^8+t^4$
$-\infty-6$
$\left(\frac{\left(x^2+1\right)^2}{x^2}\right)$
$\left(\frac{5xy^{-4}}{y}\right)^{-2}$
$\int x^2\cdot\frac{1}{\sqrt{2x-x^2}}dx$
$\int_{-\infty}^0\left(cosw\right)dx$
$-3x<-12\left(x+3\right)$
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