$\lim_{x\to1}\left(\frac{x^4-x^3-3x^2+5x-2}{x^4-2x^3+2x-1}\right)$
$\left(6\left(a+b\right)-5\left(a^2+b^2\right)\right)\left(6\left(a+b\right)+5\left(a^2+b^2\right)\right)$
$\frac{12xy}{3x^2}\\:x\\:\\:4y\\::\\:\frac{3y^2}{x}$
$\left(4-\frac{1}{3}x^2\right)^2$
$\left(x^5-\frac{5}{2}\right)^2$
$x+y=45$
$\left(xy-3y+x-3\right)dy=\left(xy+y-2x-2\right)dx$
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