$a^2b^4+18ab^2d+81d^2$
$7b^2+b$
$\lim_{n\to\infty}\left(\frac{2}{3}\right)^n$
$-11\:+\:4\left(b\:+\:2c\right)\:+\:5\:-\:7b$
$9x^2-3x-1$
$\left(43x+86\right)^2$
$\frac{d^3}{dx^3}\left(sin\left(4x\right)-cos\left(3x\right)\right)$
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