$\lim_{x\to0}\left(\frac{1}{sen\left(x\right)}-\frac{1}{tan\left(x\right)}\right)$
$3csc^{\left(2\right)}x-4=0$
$\lim_{x\to0}\left(\frac{12e^x-12-12x-6x^2}{x^3}\right)$
$6^{6\:}.\:6^{-8}$
$x^210x-24$
$\left\{x-25\right\}\left\{z+25\right\}$
$\frac{3x^4-5x^2+x-3}{x^2+1}$
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