$\frac{1}{x^{\frac{5}{4}}+2x}$
$\frac{a}{2}+\frac{\sin\left(\pi\cdot x\right)}{2}+\frac{b}{2}$
$-1-w-2w+7-19$
$\int\left(\frac{1}{u^2-u+1}\right)du$
$\cos-x^2$
$-7x^2+3x+4$
$\left(\frac{1}{81}\right)^{-3}$
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