$\frac{x^{-3}y^{-2}}{x^{-1}y^2}$
$\cos^2=0.9$
$2cos^2\theta\:-5cos\theta\:+2=0$
$t^2\cdot\frac{dx}{dt}+5tx=t^3\cdot ln\left(t\right)+4$
$16nx^3+54ny^3$
$\frac{dy}{dx}+\frac{2y}{x}=3x$
$\frac{dy}{dx}=135-0.18x$
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