$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$
$\left(\sqrt{a}\:\sqrt{b}\right)^2$
$5^2.\:5^{-1}$
$\cot\left(x\right)^2+4\csc\left(x\right)^2=-5$
$\left(4^3\right)^3$
$-454+748$
$\frac{x-3}{x+2}\ge1$
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