$7\cdot\left(-8\right)\cdot12$
$18:\left(12-3.2\right)+2.\left(26-12.3\right)$
$y'\:=\:\frac{2y}{x}=2xy^{\frac{3}{2}}$
$6x^2-116x+412=3x^2-68x+220$
$2-2\sin\left(t\right)\sin\left(2t\right)-2\cos\left(t\right)cos\left(2t\right)$
$6.72+1.3+4.72$
$12^2-4$
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