$\sqrt[2]{25}-\sqrt[2]{36x^4}$
$4a-9b+\frac{4b^3}{a^2}-\frac{9a^3}{b^2}$
$\tan^2x-8\tan x+16$
$\frac{\left(xy^2\right)^{-2}}{x^4y^5}$
$\int\frac{w^2+1}{w^2-w}dx$
$\int\left(10cos^5\left(2x\right)sen\left(2x\right)\right)dx$
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