$\frac{4a^3-5a}{2a-1}$
$-8\cos^2\theta\:+2\cos\theta\:=-1$
$m^7\left(m^2\right)^{-9}$
$\frac{-3x^3}{2x^2}$
$x^4-8x$
$\int\frac{8x^3+8x^2+12x+20}{x^4+4x^2}dx$
$\frac{\tan^2x-\sin^2x}{\tan^2x}$
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