$\left(-6\right)\cdot7+\left(-18\right)$
$arcos\:\frac{x}{2}-\frac{\sqrt{4-x^2}}{x}$
$\left(3r^5-2s^2-t\right)^2$
$\frac{9x^2-4x^2}{3x+2x}$
$\left(4x^2+-7+7\right)-\left(3x^2-3x+2\right)$
$\left(4y+5z\right)\left(4y-4z\right)$
$3a+30a^2+63a$
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