$\left(-135+128\right)\:.3\:-\:68:\:4\:$
$16v^2-8v+1$
$\frac{d}{dx}2x+y+y^3=-2x^2-3y^2$
$4+[\left(1-\left(-2-1\right)]^{2}$
$\int x\left(1+\frac{1}{x-1}\right)dx$
$\lim_{x\to\frac{\pi}{2}}\left(8\cos\left(-5x\right)\sec\left(-7x\right)\right)$
$\left(5+a\right)\left(5+b\right)$
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