$18+-1$
$\left(-x^3yz\right)\left(3x^{a+1}-2x^{a+1}+4x^{a+1}yz\right)$
$8x^2+12x+4$
$\left(2b\right)^2-\left(5a\right)^2$
$\sin\left(\arctan\left(x\right)\right)=\frac{x}{\sqrt{x^2-1}}$
$\frac{\left(5^4\right)^3}{5^9}$
$\frac{2x-3}{5}\le\frac{x-k}{2}$
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