User:Stefkar/sandbox

Степан Уерывич Карлов

$$\int_a^\infty\frac{dx}{x^2} = \frac{1}{a}$$

$$\int_a^\infty\frac{dx}{(x-b)(x-c)} = \frac{\ln((a-b)/(a-c))}{b-c}$$

You can use \cancel{...} to denote cancelling parts of an expression by striking out diagonally:

$$\frac{(a+b)(b+c)}{(b+c)(c+d)}=\frac{(a+b)\cancel{(b+c)}}{\cancel{(b+c)}(c+d)}$$