$\frac{d}{dx}\ln7x^2$
$5x-8y\sqrt{\left(x^2+1\right)}\cdot\frac{dy}{dx}=0$
$x^2-x-1x\cdot2x-3x$
$5x+1<-4$
$\frac{6x-4}{x}$
$3x^4-65x^3$
$2x-4-2x-1$
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