$\frac{1-cos^2x}{cos^3x}$
$17+19n-18-13n$
$1-\left(-48\right)$
$+10\left(8+4\right)$
$x\frac{dy}{dx}+5y=y^3$
$\frac{3}{5}x+\frac{1}{3}x=28$
$0.8\cdot50$
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