$45\:+\:\left(-53\right)\:\:-\:\left[\left(-8\:+\:11\right)\:+\:17\:\right]\:+1\:9$
$\frac{1}{2}\int\frac{1}{u}du$
$\int3xe^{2x^{2}}\sen\left(4e^{2x^{2}}\right)dx$
$\int\frac{36-9x-5x^2}{x^3-9x}dx$
$\frac{2x}{x-3}+\frac{x}{x+4}=\frac{3}{x+4}$
$28x\:-\:69xy\:-\:22y\:-\:36x\:-\:71y\:-\:40$
$-5^2+20+12$
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