$4\left(4\right)x^2-81$
$\lim_{x\to0}\left(\frac{\sqrt{x+8}-\sqrt{18}}{x+10}\right)$
$3y'=-6xy$
$\left(xy-y^2\right)dx+\left(x^2+xy\right)dy=0$
$x^2-3x^3+8x^4$
$1-\sin^2\left(x\right)=\cos^4\left(x\right)+\sin^2\left(x\right)\cos^2\left(x\right)$
$1^2-4\cdot1+3$
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