$\left|2-42\right|+\left(-90\right)$
$5 - \{ ( 8 - 6 : 3 ) + 4 ( 5 \cdot - 3 + 5 ) - 7 \}$
$\sin x\cot x=0$
$10n^2+40n$
$\frac{a}{b}\:+\:bc$
$-x^2-\frac{3}{7}x^2$
$\frac{2x}{3y^2}\cdot\frac{6y}{x^2}$
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