$laplace\:\left\{\cos kt\right\}$
$5-\left(26-19\right)$
$\left(-48\right):\left(-4\right).\left(-3\right):\left(-6\right)$
$4a^4b^4+24a^2b^2+36$
$y'=-2y$
$2\sqrt[4]{3y^3}\cdot5\sqrt[4]{54y^3}$
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