$8c^2-36$
$\lim_{x\to0}\left(\frac{x-sen\left(x\right)}{tan^3x\:dx}\right)$
$\lim_{x\to0}\left(\frac{sin5x-sin3x}{x}\right)$
$-6ab+8ab^2+4a^2b$
$\lim_{x\to0}\left(\frac{tan\left(x-1\right)}{x-1}\right)$
$\lim_{x\to\infty}\left(\frac{5x^3-3x}{7x^2+1}\right)$
$-4x^2+4x+15$
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