How to create basic document using LaTeX
1. \\ is soft return without identation or single blank line for hard return.
2. Math mode start with $ and end with $ to start text mode
3. For math mode with own line, $$ sign is used.
This is my first LaTeX document.
Suppose we are given a rectangle with side
lengths $(x+1)$ and $(x+3)$. Then the equation
$$A=x^2+4x+3$$ represents the area of the rectangle.