$3.2\cdot3.14$

$\int_0^{\pi}\left(26sen^4x\right)dx$

$\lim_{x\to\frac{\pi}{4}}\left(\cot\left(x-1\right)\cdot\sec\left(2x\right)\right)$

$\frac{3a^2-12b}{3a}$

$\int\:\frac{4e^{3x}}{1+e^{2x}}dx$

$\lim_{x\to1}\log\left(x\right)\log\left(x-1\right)$

$\left(m^3+3\right)^3$