$9+3x+6+9x+5$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)+1}{x^2+3x}\right)$
$x^2-16x+64=0$
$2y\frac{dy}{dx}=3x^2$
$20a^2-45a$
$\left(7+4a\right)\left(7-9a\right)$
$\int3x^22^{x^3-3}dx$
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