$\int\sqrt{n}dn$
$\int t^3dx$
$-2x^2\left(3x^2-x\right)$
$\cos\left(3x\right)\cos\left(9x\right)-\sin\left(3x\right)\sin\left(9x\right)$
$16.75-8.1$
$3\sec^2x+9=13$
$25xy\:-\:15xz\:-\:10x$
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