$3x^2+y=0$
$x^3+2x^2-8x$
$1-\sin^2\left(a\right)=\sin\left(a\right)\cos\left(a\right)$
$-\int\frac{3}{x^2+1}dx$
$+4-13+2-23+3-1+16-17-2-5$
$-4\:+\:5x\:-\:7$
$2u^2-u\sqrt{2}$
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