$-0.4+-0.9+0.8$
$\sqrt[8]{\left(x^4y^{24}\right)}$
$13-\left(-13\right)$
$\frac{1}{\sqrt{n}-1}$
$\left(-5x\right)^{-1}$
$\cos^2\left(90-x\right)\cot\left(x\right)=\sin\left(x\right)\cos\left(x\right)$
$\left(8m+n\right)^2.\:\left(8m-3n\right)^2$
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