$6x-8y-5x+3y$
$-\int_1^x\left(e^{-x^2}\right)dx$
$\int\left(csc^2\left(1-cotx\right)\right)dx$
$u^2+16u$
$-\frac{28z^9}{14z^7}$
$\lim_{x\to2}\frac{5x^3}{x^2-3x+2}$
$10x^3-40x^2-40x$
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