$\left(x+2\right)^2-\left(x-3\right)^2$
$x^2-6=x$
$\sqrt{\frac{x^2-9}{x}}$
$\tan^2a+1=-3\sqrt{3}^2$
$\left(a+b+c\right):2a$
$\int\left(xe^{1-3x^2}\right)dx$
$4+-3^2+2+-3+3$
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