$\left(\frac{1}{2}a^2b^3-5ab+3\right)-\left(a^2b^3+\frac{1}{3}ab-6\right)$
$\left(x^8+5\right)\left(x^8-2\right)$
$4\sec\left(x\right)\tan\left(x\right)\cos\left(x\right)$
$\frac{2x-1}{x}<-2$
$2a-5a^2$
$\left(5y^2+14\right)\left(5y^2-14\right)$
$3+12\cdot19-10$
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