$\int\frac{5x-2}{\left(x+5\right)\left(x-4\right)}dx$
$4x^2-4x-39$
$\lim_{x\to0}\left(1+x\right)^{\frac{1}{\sqrt{x}}}$
$\:7x\:+\:2y\:+\:5\:-\:5x\:+\:9y\:-\:1\:$
$64-49x^2$
$8\cdot5-8\cdot8+4$
$\int\frac{2x^3-1}{\left(x^2+1\right)}dx$
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