$4x^2=21$
$2x+\frac{1}{3}\ge2$
$\frac{\sin\left(y\right)-\left(-3\sin\left(y\right)\right)}{x\sin\left(y\right)}$
$\frac{s^2}{s^3-1}$
$2\sqrt{8}\sqrt{20}$
$\frac{x^3+x+2}{x+1}$
$\left(a-2b+4\right)\cdot\left(-5c\right)$
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