$\lim_{x,y\to0,0}\frac{\left(y^2-x\right)}{x^2+y^2}$
$9x^2-3x-5+5x-9$
$\frac{y^8-1}{y-1}$
$\frac{x^2-4x+16}{4-x}$
$\int_{-3}^3\left(\frac{7}{x^6}\right)dx$
$\frac{u-8}{-16}=4$
$9\left(2t+5\right)$
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