$\left(\cos^2-1\right)\left(\tan^2+1\right)=1.\sec^2$
$\frac{5b^{-2}}{b^{-3}}$
$\frac{-8}{x^2-3x}$
$\frac{\left(3x^2-1\right)^2}{\left(2x-1\right)^3}$
$x-\frac{-1}{x\sqrt{\frac{1}{x^2}-1}}$
$2.25\cdot10^5+1.15\cdot10^2-3.25\cdot10^3$
$\left(5a^{n+1}-3a^m\right)^2$
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