$\tan^2x-2tanx-4=0$
$\left(2x\:-\:3y\right)\left(3\right)$
$\left(-2\right)\left(-5\right)\left(-4\right)\left(-8\right)$
$-3x^2-x+10$
$\int\pi^{2}dx$
$16x^2+8x-79=0$
$\sqrt{16\cdot81}$
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