**file1_area_under_func**
![file1_area_under_func](gifs/file1_area_under_func.gif)

**file2_volume_under_surface**
![file2_volume_under_surface](gifs/file2_volume_under_surface.gif)

**file3_y_limit_dependent_on_x**
![file3_y_limit_dependent_on_x](gifs/file3_y_limit_dependent_on_x.gif)

**file4_non_rect_region**
![file4_non_rect_region](gifs/file4_non_rect_region.gif)

**file5_elementary_area**
![file5_elementary_area](gifs/file5_elementary_area.gif)

**file6_doing_integration**
![file6_doing_integration](gifs/file6_doing_integration.gif)

**file7_int_process_of_example**
![file7_int_process_of_example](gifs/file7_int_process_of_example.gif)