$\lim_{x\to\infty\:}\left(\frac{x-sen\left(x\right)}{x+sen\left(x\right)}\right)$
$97\cdot100$
$x^2-14\left(3\right)-51$
$\lim_{x\to\lim_{x\to0}\left(2\right)}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$a^6-9$
$5^2+5^2$
$b^2-26b$
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