$\left(x^2+3x+1\right)\left(2\right)+\left(5x-7x-4\right)\left(2\right)$
$\left(9-z\right)\left(-9-z\right)$
$\log\left(250\right)+\log\left(4\right)$
$\left(\csc^2x-1\right)\sin^2x=\cos2x$
$12a^2b+3ab-8a^2b-10ab^2-3a^2b+6ab^2$
$\int\frac{60x^4}{4x^5-5}dx$
$x^4-3x$
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