$4\:x\:9,1$
$5\tan0-4=7\tan0+11$
$\lim_{x\to\infty}\left(\frac{sin\frac{1}{x}}{x^{-1}}\right)$
$\lim_{x\to16}\left(\frac{sin\left(12x\right)-12xcos\left(12x\right)}{12x-sin\left(12x\right)}\right)$
$\left(8b^5d^4\right)^4$
$16+40y+25y^2$
$39x+9+40x$
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