$\frac{\left(cot-cotcos\right)}{tan-sin}=cot^2$
$\lim_{x\to0}\left(\frac{cos4x}{sen^2x}\right)$
$-2x-3x^2-5=-1$
$\frac{1}{x^2\sqrt{2-3x^2}}$
$\frac{d}{dx}y^3-3xy+x^3=6$
$-10+-14+2$
$a^3-3a^2b+5ab^2$
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