$51\:-\:-50$
$3n^3\cdot n^2$
$9x^2-12x$
$\left(4x-b\right)\left(3a+b\right)$
$\int\frac{z^2}{\sqrt{64-z^2}}dz$
$\lim_{x\to\sqrt{3}}\left(\frac{\sqrt{\left|3-x^2\right|}}{x-\sqrt{3}}\right)$
$\int3\:cos\:\left(2x-1\right)\:dx$
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