$\lim_{x\to0}\frac{\sqrt{9-x^2}-3}{7x}$
$\left(6k-t\right)\left(6k+7\right)$
$\left(x^2-2y^2\right)^2\left(x^2+2y^2\right)$
$cos2\left(t\right)=1-2sin\left(t\right)^2$
$\frac{d}{dx}\frac{8x-5}{6x-3}$
$g\left(x\right)=\left(4-8x\right)^3$
$\frac{d}{dx}\frac{x}{x+y}=y$
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