The line that is drawn may be straight or it may be curved. In a text environment, computers will often use computer notation. It will take a little getting used to, but the changes are simple to follow. Most word processors will allow the use of formatted characters. Text files and many email programs do not.
Computer language uses slightly different formats for some common mathematical operations.
Exponents do not work in text documents. Square root signs do not work well in text. Subscripts do not work in text documents. Equations involving multiplication will look different. Most ten-key numerical keyboards have the mathematical symbols.