$\frac{1-\sin^2a}{\cos a}=\cos^2a$
$\frac{6x^3-11x^2+3}{-x^2+2x}$
$\frac{dy}{dt}=10x$
$2csc\left(x\right)cos^2\left(\frac{x}{2}\right)$
$-\frac{1}{2}\cdot100$
$\lim_{x\to8}\left(\frac{\sqrt{x+4}-\sqrt{12}}{x-8}\right)$
$5c\:bajo\:0$
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