$x^4\cdot3x^2+2x$
$50^2+2\left(50\right)^2+4^2$
$( 7 x + y ) ( 7 x - y ) = 7$
$\frac{4x^3-5x^2-2x+1}{x-1}$
$25x^2+100x$
$\frac{\left(x+2\right)^2}{x^2-3}+\frac{x-3}{x+2}$
$\lim\:\:_{x\to\:\:0\:}\left(\frac{4x^4-2x-3x^5}{2x+5x^2}\right)$
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