$\frac{x^{2}+11x+18}{x^{2}+2x}\cdot\frac{x^{2}-9x}{x^{2}-81}$
$x^2-5x=-6$
$0.75+\frac{4.5}{\frac{2}{3}}$
$\left(a^2\:-\:w\right)^2$
$4e^1$
$3\tan\left(60^{\circ}\cot30^{\circ}\sin45^{\circ}\csc45^{\circ}\right)$
$a^2+8+16$
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