$2ab^2-a^3b$
$\left(-11\right)\cdot\left(-18\right)$
$2x^2-3x-2;\:x=-2$
$25x^260xy^2+36y^4$
$\frac{d}{dx}\frac{1}{2}x^4+\frac{3}{5}x^3$
$7x^3y+3yx$
$4\cos^2x=2$
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