$21-+-42$
$3\frac{df}{dx}+5x^f\:=\:0$
$y2\:+\:8\:=\:6y$
$f\left(x\right)=9x^3+9x$
$\frac{d}{dx}e^{x^2}y=x+y$
$\frac{\cos\:\left(\theta\:\right)}{1-\sin\:\left(\theta\:\right)}\:solve\:for\:\left(\theta\:\right)$
$\frac{3.5\cdot10^7}{7\cdot10^{-3}}$
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