$\int3\:\tan\left(3x\right)dx$

$3a^3-5ab^2-6a^2b^2\:entre\:-2a$

$\int t^2\cdot tan^5\left(3t^3\right)\cos\left(3t^3\right)dt$

$\lim_{x\to0}\left(1-\sqrt[3]{x}\right)$

$-36-\left(4\cdot1\cdot16+2\cdot1\cdot9\right)$

$\frac{dy}{dx}=3x^2+5x-3$

$\int_0^{\frac{\pi}{2}}\left(sen\left(2nx\right)\right)dx$