$2x-40>50x+16$
$\frac{d}{dx}arccos\frac{x}{3}$
$\lim_{x\to0}\left(\frac{e^{4+h}-e^4}{h}\right)$
$45^2+18s+1$
$4x^2-20x+11$
$\left(x^2y^3\right)^0$
$9^x+4\cdot3^{x+1}-45=0$
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