$\sqrt[2]{-18\cdot\sqrt[2]{-2}+\left(-1\right)}^5-2\left(-3\right)^2$
$csc^2a-2$
$81x^2-1$
$\frac{x}{4x^2+2x}$
$3\left(2+-1+3\right)$
$\sqrt{x}+\sqrt{y}=12$
$\ln\left(x\right)-ln\left(3\right)=5$
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