___________ / 2 2 \/ 4*r - x
/ ___________\ d | / 2 2 | --\\/ 4*r - x / dx
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Differentiate term by term:
The derivative of the constant is zero.
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
-x -------------- ___________ / 2 2 \/ 4*r - x
/ 2 \
| x |
-|1 + -----------|
| 2 2|
\ - x + 4*r /
-------------------
_____________
/ 2 2
\/ - x + 4*r