### Home > CALC > Chapter 8 > Lesson 8.3.1 > Problem8-102

8-102.

Multiple Choice: $\frac { d } { d x } [ \operatorname { arccos } ( 3 x ) ]$ =

1. $-\frac{3}{\sqrt{1-x^2}}$

2. $\frac { - 1 } { 3 \operatorname { sin } 3 x }$

3. $-\frac{3}{\sqrt{1-3x^2}}$

4. $-\frac{3}{\sqrt{1-9x^2}}$

5. $-\frac{3}{\sqrt{9x^2-1}}$

Without jumping straight into the Chain Rule, you can figure this out. Visualize what the 3 does to the graph of y = arccosx? It will do the same thing to the slope function.