$\frac{3x^4}{12x^3}$
$\lim_{x\to0}\left(\frac{\cos\left(a+1\right)-\cos\left(a\right)}{x}\right)$
$\frac{5x^2+4x}{2x+5}$
$cos\left(\frac{24}{25}\right)cos\left(\frac{4}{5}\right)-sin\left(\frac{24}{25}\right)sin\left(\frac{4}{5}\right)$
$3\left(x+5\right)-5$
$13x=416$
$10+\left(12\right)-\left(-8\right)+\left(-23\right)$
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