$5.x^5=-160$
$2s^3t-16t^4$
$\frac{cos\theta\:+sen\theta\:-sen^3\theta\:}{sen\theta\:}=cot\theta\:+cos^2\theta\:$
$3x>21$
$y'-y=e^{-2x}$
$-10-25+25+50$
$\frac{dy}{dx}=\frac{-y}{x}+2x-1$
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