$\int_0^4-\sqrt{16-\left(x-4\right)^2}dx$

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

$\int_{\frac{y}{2}}^3\left(x\sin\left(y\right)\right)dy$

$5-\left(5.4\right)$

$\int\frac{2x}{\left(x^2+x+1\right)\left(x^2+4\right)}dx$

$-9x+2+9x$

$\left(2-5x\right)-4\left(6x-6\right)$