$\lim_{x\to0}\left(\frac{sen\left(4x\right)-2x}{x}\right)$
$\frac{\left(b^8\right)^6}{b^{15}}$
$a^2b-a^2b-3a^2b$
$\frac{x^3}{2x}$
$45-2\left(13x-2\right)$
$\int\frac{4x}{\sqrt{9x^2-13}}dx$
$\left(\sqrt[4]{225}\right)^2$
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