$\lim_{x\to0}\left(\frac{sen\left(3x\right).\cos\left(3x\right)}{3x}\right)$
$\lim_{x\to0}\frac{9\left(e^x-1-x\right)}{-4x^3}$
$-11x^2+22x-10.93$
$\lim_{x\to-2}\left(-x^3+x\right)$
$\lim_{x\to3}8$
$-\frac{3}{4}x-\frac{5}{4}x$
$y''+5y'+4y=0\:,\:\:y\left(1\right)=0\:y'\left(1\right)=2$
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