$5cos\theta\:-4=-9;\:0^{\circ\:}\le\:\theta\:\le\:180^{\circ\:}$
$20c\:sobre\:0$
$\int\left(8x-6\right)e^{-2x}dx$
$\frac{dy}{dx}=e^{-5x}-4y$
$m^2w^2+w^2m^2$
$\frac{1-2cos^2\left(x\right)}{sin\left(x\right)+cos\left(x\right)}$
$x+4-4^2+x-12$
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