$90\:+\:-71\:+\:27\:+\:-75\:+\:-66$
$x\frac{dy}{dx}-3y=x^4cosx$
$-4x\ge8$
$\left(\frac{1}{2}-\frac{\sqrt{3}}{2}i\right)^{16}$
$3x-18\:<75$
$\left(4x^3+5x\right).\left(4x^3-5x\right)$
$4y^2-16y+16$
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