$k=\frac{-2cos2xsenx+2cos4xsenx}{2sin3xsen2x}$
$\int2\:\sin\left(x\right)\cos\left(x\right)\:dx$
$\sqrt[3]{a\cdot b\cdot c^2}\cdot\sqrt[4]{a^2\cdot b\cdot c^3}\cdot\sqrt[12]{a^2\cdot b^5\cdot c^7}$
$\lim_{x\to0}\left(\frac{e^{2x-7}}{3x}\right)$
$-13b+4b-b$
$\frac{4x^0}{2^{-4}}$
$52-3x<-14$
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