$9x^2-12x+8$
$5x-1<7$
$\frac{1+\sin\left(b\right)}{\cos\left(b\right)}=\frac{\cos\left(b\right)}{1-\sin\left(b\right)}$
$\frac{dy}{dx}=\frac{\left(1-xy\right)}{x^2}$
$ydy-dx=0$
$-\left(4-\sin^2\left(x\right)\right)$
$\int\left(\left(\frac{x}{9}\right)^n\right)dn$
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