$\lim_{x\to-1}\left(2-3x^2-4x^3+2x^4-x^5\right)$

$\int\sin^5\left(7x-2\right)dx$

$\int\frac{\left(7x+9\right)}{\left(14x^2+36x\right)^5}dx$

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

$\frac{3x^2y^3}{2x^3y^4}$

$\lim_{x\to1}\left(\frac{x+2}{-x^2-x+2}\right)$

$\sin\left(2x\right)=4\sin\left(2x\right)-1$