$\left(a^{x}+b^{n}\right)\left(a^{x}-b^{n}\right)$
$\left(-2a^2+\left(bc\right)^3\right)\left(2a^2+\left(bc^3\right)\right)$
$\lim_{x\to0}\left(\frac{e^x-1}{cos3x}\right)$
$tan^2xcscx$
$-3\left(4-8\right)+4-1\left(-5+9\right)-9$
$\frac{\left(4x^3+2x^2-2x-3\right)}{2x-1}$
$3x^2+12x-13>0$
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