$36-25b^2$
$-\sin\left(x\right)^2-2\cos\left(x\right)^2$
$\lim_{x\to\infty}\left(\sqrt[3]{8x^3-x^2}-\sqrt[3]{8x^3-4}\right)$
$\left(x\:-7\right)^2\:+\:y\:^2=\:45$
$-4u^2+6u^2$
$7ab+4ab-3ab$
$\frac{-0}{0+1}$
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