$\frac{2xy^4}{2y^2\cdot\left(x^{-4}y^{-12}\right)}$
$-9r+12=-24$
$\lim_{x\to0}\left(x^2\cos\left(\frac{e^x+x^5}{10}\right)\right)$
$\frac{1}{y}y'=\frac{1}{-4-x^2}$
$\lim_{x\to0}\left(\frac{x^2+ax+b}{x^2-1}\right)$
$\frac{\cos^2\theta-\text{sen}^2\theta}{\text{sen}\theta\cos\theta}$
$\left(k-4\right)\left(2k-3\right)$
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