$\left(xy+6y^3\right)^2$
$2x+7=-2x-21$
$\frac{dy}{dx}\left(x^2+y^2=1+xy\right)$
$a^2\:for\:a\:=-3$
$\frac{x}{\:x+2}-\frac{1}{x-2}=\frac{8}{x^2-4}$
$3\cdot\sin\left(y\right)=x+4\cdot\sin\left(y\right)$
$\lim_{x\to\infty}\left(9+x^5\right)^{\left(\frac{7}{x}\right)}$
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