$1-\sin^2\left(x\right)=2\cos\left(x\right)$
$\frac{dy}{dx}+3y=18$
$\frac{3xy}{xy}$
$y^2+4y+16$
$a^4-3a^2+9$
$2-\left(-30\right)$
$\lim_{x\to-\infty}\left(\frac{-7x^2+6}{x^2+2x-3}\right)$
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