$9x\cdot x^2$
$\frac{2z}{y}-\frac{4}{5y}$
$-5+3+2+9+-7$
$\frac{a^{-6}}{a^{-8}}$
$\lim_{h\to0}\left(\frac{2\cos\left(h+x\right)-2\cos\left(x\right)}{h}\right)$
$\frac{dy}{dx}-\frac{y}{2}=4e^{0.01x}$
$x^2+3x-130$
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