$\left(ambnc\right)\left(-amb^2n\right)$
$\lim_{x\to0}\:\sqrt{x+4}$
$\frac{2x^3+x-6}{x-2}$
$x^5^9-x^6^0$
$\left(a+b\right)+1\left(a+b\right)-1$
$tanx-tanxcsc^2x=cotx$
$\left(5x+2\right)^{2}+\left(5x-2\right)^{2}-2\left(5x-2\right)\left(5x+2\right)$
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