$a^2-4=12$
$\cot\left(2a+3b\right)$
$\left(\frac{3}{4}b^2c+2y\right)\left(\frac{9}{16}b^4c^2-\frac{3}{2}b^2cy+4y^2\right)$
$\frac{x^2}{64}-\frac{y^2z^4}{100}$
$-45x^2+210x-225$
$\tan^2\left(60\right)+\cot^2\left(45\right)$
$2^{-\infty}$
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