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

$\int_0^{+\infty}\left(\frac{2}{3+e^x}\right)dx$

$100a^2b^3c+150ab^2c^2+50ab^3c^3$

$\int_2^3\:\frac{\sqrt{x^2+\:4}}{x}dx$

$\left(10x^4+8\right)\left(10x^4-\frac{2}{5}\right)$

$5\left(10a+1\right)+2\left(2+8a\right)$

$\int3ln\left(x^2-x+2\right)dx$