$\left(a^2b+\frac{8}{3}\right)\left(a^2b-\frac{8}{3}\right)$
$\lim_{x\to0}\left(\frac{\cos x}{sinx}-\frac{1}{x}\right)$
$3a+\left(-5a\right)+a$
$-23+-155$
$\left(3xm-2xn\right)^2$
$y^2+20y+100$
$\frac{d}{dx}\sqrt{x}+\sqrt{y}=1$
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