You are given the coordinates of two axis-aligned rectangles in a 2D plane. Your task is to calculate the total area covered by both rectangles.
The first rectangle is specified by the coordinates of its bottom-left corner (ax1, ay1) and top-right corner (ay1, ay2).
Similarly, the second rectangle is defined by its bottom-left corner (bx1, by1) and top-right corner (bx2, by2).
Note: The rectangles may overlap.
- -10^4 ≤ ax1 ≤ ax2 ≤ 10^4
- −10^4 ≤ ay1 ≤ ay2 ≤ 10^4
- −10^4 ≤ bx1 ≤ bx2 ≤10^4
- −10^4 ≤ by1 ≤ by2 ≤ 10^4
