$2.580+3.500$

$\left(5\right)\cdot\left(a^2-3+b^2\right)$

$\int_{-3}^{-3}\left(e^{2x}\right)dx$

$e^{\ln\left(1-\frac{1}{x-1}\right)}=e^t$

$\lim_{x\to1}\left(\frac{\sqrt{x+3}}{x-1}\right)$

$\frac{\cos\left(x+a\right)-\cos\left(x-a\right)}{x}$

$\left(2m+1\right)\left(4m^2-2m+1\right)$