$\lim_{x\to0}\left(\frac{\left(e^x-1\right)sen\left(x\right)}{x^2}\right)$

$3x^2-10x+6=19x-9-9x^2$

$\frac{66w^7}{-6w}$

$\int\left(\sec\left(x\right)\right)^5\cdot\left(\tan\left(x\right)\right)^2$

$\int\left(7xe^{3x^2}\right)dx$

$4\int\tan\left(x\right)\sec\left(x\right)dx$

$\left(a^2x^3+1\right)\left(-a^2x^3+1\right)$