$f\left(x\right)=\left(2x+6\right)^{-2}\left(5x-1\right)$
$4-3+54-20+8-9$
$4x^2+2xy+\frac{y^2}{4}$
$\left(1+x^2\right)+y^2\left(x^2+1\right)dy=y^2dx$
$2\left(-3\right)+9$
$s_{\text{eft}}\left(a\right)+3=4-\cos^{2}\left(a\right)$
$\lim_{t\to2}\left(\frac{\sqrt{x}-\sqrt{2}}{x-2}\right)$
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