5 is a constant. The derivative of any constant is 0.

If you want a more rigorous proof:

Or an even more rigorous proof:

Results 1 to 4 of 4

- July 25th 2013, 12:45 AM #1

- Joined
- Jan 2013
- From
- Pizza
- Posts
- 57

- July 25th 2013, 12:58 AM #2

- July 25th 2013, 03:19 AM #3

- Joined
- Jan 2013
- From
- Pizza
- Posts
- 57

- July 25th 2013, 05:41 AM #4

- Joined
- Apr 2005
- Posts
- 16,903
- Thanks
- 1983