$\frac{d}{dx}2xy+3=0$
$\int\frac{\sqrt{x^2-+36}}{4x^2}dx$
$\left(3a^3-7xy^4\right)^4$
$\lim_{x\to0}\left(\frac{8^x-7^x}{5^x-4^x}\right)$
$w^3+3w^2+3w+1$
$20 - 5 \cdot 4$
$y - \frac { x ^ { 2 } + 1 } { 3 x + 2 }$
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