$\lim_{x\to1}\left(\frac{\left(1-n\right)^{1-x}}{1-x}\right)$
$2+4x+4$
$2<-8-u$
$1.500\:-\:2.100\:$
$4x-4+2x\ge68-2x$
$tan^2x+\frac{1}{sen\:x\cdot\:csc\:x}$
$\lim_{x\to0}\frac{15x^3}{sin\left(x\right)-x}$
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