$\frac{4x^6-3x^4+x^2+5}{x-1}$
$5x^{-2}-14x^{-1}-3=0$
$\log\sec x+\log\tan x=0$
$\left(bx-cy\right)^3$
$\frac{6x^2+13x-5}{6x^2+17x+5}$
$3cos\left(x+2\right)$
$\lim_{x\to0}\left(x\cdot\:sen\left(\frac{3}{x}\right)\right)\:$
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