$$\text { Find the formula for } d f ^ { - 1 } / d x \text {. }$$

Multiple Choice

$$\text { Find the formula for } d f ^ { - 1 } / d x \text {. }$$
- $$f ( x ) = ( 10 - x ) ^ { 3 }$$

A) $- 3 ( 10 - x ) ^ { 2 }$
B) $- \frac { 1 } { 3 x ^ { 2 / 3 } }$
C) $10 - x ^ { 1 / 3 }$
D) $x ^ { 2 / 3 }$