$\left(20\right)-\left(-16\right)$
$\left(a^2+5d^3\right)\left(a^2-5d^3\right)$
$d^4+2d^2+3md$
$\frac{1}{2}x+2-1$
$4x\:-\:2x$
$\frac{22x^{16}y^8}{6x^4y^2}$
$\cos\left(\arctan\left(\frac{3}{x}\right)\right)$
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