$8\:senx-3=0$
$w^4+2w^2+9$
$\frac{5}{x+3}+\frac{3}{x-3}=\frac{x}{x-3}$
$5x^2y^2-15zy+20zyz$
$-\left(x+t\right)^2$
$\left(3a+8b^3\right)^2$
$12x^2y-18xy^2z$
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