$xy'-e^x=-y$
$2\cos2x=0$
$6x\:and\:3x$
$\left(\frac{4^7}{5^2}\right)^3$
$\int_1^3\left(x\left(3-x\right)^2\right)dx$
$\frac{2x^3-5x^2+x-2}{x-1}$
$-7\cdot3\cdot\left(-3\right)$
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