$\left(5x+2y\right)\left(5r-2y\right)$
$x\cot^22x^2$
$6\cdot3\cdot4$
$-220+250-200+330+170+140-160$
$\int\frac{x^6-x^3}{x^4+9x^2}dx$
$20>x$
$-x+1+1$
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