$\lim_{x\to\infty}\:\frac{3^x-2^x}{x}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{sen\left(x\right).\ln\left(\sin\left(x\right)\right)}{\cos\left(x\right)}\right)$
$3x+2<5x-8$
$\int\:x^{-3}dx$
$3x^2-xy-2y^2\left(x=;y=2\right)$
$81\cdot25$
$-4\:\cdot3$
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