$\left(f^3-5f+25\right)-\left(4f^2-12f+9\right)$
$3e^1$
$\lim_{x\to0}\left(\frac{cos4x}{xtan2x}\right)$
$\left(2-senx\right)^2$
$3+4-5+4$
$\lim_{x\to5}\left(\frac{3x^2-13x-10}{2x^2+7x-15}\right)$
$\lim_{x\to4}\left(4x^2-5x+1\right)$
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