$\lim_{x\to1}3$
$\frac{1296-x^4}{6-x}$
$\int\left(x^6\left(9+x^7\right)^7\right)dx$
$\left(\sqrt{x^4}x^2\right)\left(\sqrt{x^2y^2}\right)$
$6x^2+47x+35$
$\cos\left(4x\right)\cos\left(x\right)+\sin\left(4x\right)\sin\left(x\right)=1$
$\lim_{t\to4}\left(\frac{t^3-2t-56}{t^2-t-20}\right)$
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