$log\left(x+1\right)+log\left(x+2\right)=3$

$\int\frac{1}{1+2x+x^2}dx$

$xy^{-2}\cdot x^{-1}y^{-2}$

$\left|2\cdot3\right|$

$\left\{14+8\right\}-\left\{10+5\right\}+\:\left\{23+13\right\}$

$\lim_{x\to0}\left(1+7x\right)^{\frac{7}{x}}$

$\int_{1.1}^{\infty}\left(\frac{1}{x^3+x}\right)dx$