$\left(4^5\cdot4^{-4}\right)^{-2}$
$10mn\frac{3x}{7}$
$9b^2-7b^2-7+7$
$5\cdot\left(-\infty\right)$
$c+9=9+c$
$\lim_{x\to-\infty}\left(\frac{3x^2}{e^{-x}}\right)$
$tan\theta-cot\theta$
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