$x^3\frac{1}{x-1}$
$\int\frac{x^4-x^3+2x^2-2x-8}{x^2-4}dx$
$x^2-4x+4\le0$
$23-4-4+45$
$\sin2x=5\sin x$
$\left(y^6+3x^2\right)^2$
$5x^2+\:6x^2+\:9x\:+\:7x$
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