$12^2-\left(15\cdot12\right)+56$
$5x^2+21x+18=0$
$x^2+4x-60$
$\frac{a}{2}+\frac{a}{3}+\frac{a}{4}$
$\left(x-\frac{3}{5}\right)\left(x+\frac{3}{4}\right)$
$\int\left(\frac{2x+5}{x^2+4x-12}\right)dx$
$\int y\sqrt{y^2-3}dy$
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