$\lim_{x\to0}\left(\frac{\cot\left(\pi.z\right)}{z^2}\right)$
$8+4-6-9+19-12+15-19$
$15a^3-6a^4+12a$
$6x-3=3x-18$
$\sqrt{\left(2+\sqrt{3}\right)\left(2-\sqrt{3}\right)}$
$\frac{1}{3x-2y}+\frac{x-y}{9x^2-4y^2}$
$\frac{5}{3}-x>3$
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