$-3\cdot2-5\cdot\left(-3\right)+7$
$\left(x+1\right)\:=\:-4x-4$
$53+\left(-0.21\right)$
$e^2=2.7183$
$\frac{\sqrt{98}}{7}$
$y:\frac{\left(\tan\theta+1\right)\left(\tan\theta+1\right)-\sec^2\theta}{\tan\theta}$
$2\sqrt{y}\frac{dy}{dx}-3x=0$
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