$y''+7y'+12y=0$
$\lim_{x\to1}\left(\frac{\left(10^x-9^x-1\right)}{x^2-1}\right)$
$\lim_{x\to\infty}\left(\frac{2x^3}{\ln\left(x\right)}\right)$
$60x+60=50x+90$
$\frac{sinx-1}{1-sin^2x}$
$\sqrt{s^2}t^2p$
$2\cos\left(\theta\right)-1=0$
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