$f\left(1\right)=51^2-41^2+111+17$

$\lim_{x\to\pi}\left(\frac{\text{sen}\left(\pi-x\right)}{\pi-x}\right)$

$-113\cdot4$

$\int_x^{x^2-2}\left(\frac{t^2-2}{t^2-1}\right)dt$

$-1.-5z^3$

$\int5x^2\:e^xdx$

$\int\left(\frac{sin\left(45x\right)}{1+\cos^2\left(45x\right)}\right)dx$