$2logx-1\:=\:log\left(1-2x\right)$

$5x^{\left(2\right)}-40xy+80y^{\left(2\right)}$

$\int e^{a\cdot x}\:sen\left(k\cdot x\right)$

$\lim_{x\to0}\left(\frac{\pi\cdot x\cdot\coth\left(\pi x\right)-1}{2\cdot x^2}\right)$

$\int e^3\sin\left(2x\right)dx$

$-\sqrt[3]{2x^2}.\sqrt[3]{8x^5}$

$\lim_{x\to0}\left(secx\right)\left(\frac{1}{x}\right)$