$3b+2b^2$
$\lim_{x\to6}\left(\frac{x-5-\sqrt{x^2-35}}{v-6}\right)$
$8n-9n+5-9n-9$
$1-\sin^2$
$\left(7f-4g\right)^2$
$cos=0.45$
$\frac{dy}{dx}=\frac{-\left(4x^2-y^2\right)}{\left(6y^2-2xy\right)}$
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