$\frac{dy}{dx}=\frac{2y}{x^2+4}$
$\lim_{u\to-2}\sqrt{u^4+3u+6}$
$12\sin\left(23\right)=c$
$98x^2y^2z-18q^2z$
$-x-20=2x+1$
$6af\left(5a+6f\right)$
$100c^2-180c+81$
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