$x^5-3x^4+x^3-2x-1;\:x=2$
$\int\frac{-3}{x^2\sqrt{x^2-9}}dx$
$6.1\cdot4.7$
$2yx^2\cdot8x^3$
$\int\left(\frac{1}{2\sqrt{u}}\right)du$
$4x+2\left(5xy-x\right)\:$
$3y+y+2y^2-x^2$
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