$2 y - 4$
$\frac{d^2}{dx^2}\left(x^2y^2-y^3+3x^4+5\right)$
$\left(x^2+x+1\right)\cdot\sqrt{5-\left|x\right|}$
$\left(5b-2\right)^2+4=25b^2-20b$
$\lim_{x\to4}\frac{1}{x-4}$
$6b+b$
$8x^2y^2z^3-8x^2y^2$
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