$\lim_{x\to0}\left(\frac{24}{x}-\frac{24}{e^x-1}\right)$
$\left|2-42\right|+\left(-90\right)$
$\left(5-6x^2\right)\left(5+6x^2\right)$
$\left(\sqrt{3x-5}\right)^2$
$2x^2+3x-1^2$
$\frac{3a^{-5}b^2c^{-2}}{a^{-1}b^{-4}c}$
$f\left(x\right)=\frac{x^4}{cos^2\left(x\right)}$
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