$2cos\left(x\right)=-18cos\left(x\right)-10$
$\int-cos\frac{x}{2}dx$
$x^2-30x-8800=0$
$e=2\sen^{2}90^{\circ}+\cos^{2}360^{\circ}$
$x^2-3x-2.25$
$x4+4<0$
$\lim_{x\to0}\left(68\right)$
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