$x^2+2y^2+2x-8y+7=0$
$\left(xy\:cosx\right)\:dx\:+\:dy\:=\:0$
$9\left(x^2-10x\right)+4\left(y^2-6y\right)=-225$
$\left(\frac{1}{5}r-\frac{3}{4}r\right)^2$
$\lim_{x\to0}\left(\frac{x^4-1}{x^3-1}\right)$
$x^2-10x+21<0$
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