$9x^8+18x^5$
$x^2\left(x-8\right)+3\left(8-x\right)$
$\tan\left(u\right)\cot\left(u\right)$
$\frac{2cos\left(x\right)-2sin\left(x\right)}{sin\left(2x\right)}$
$\int_1^3x^2\sqrt{y}dy$
$4n^2-32n=-4n^2-14$
$8^2+5y$
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