### Home > CALC > Chapter 6 > Lesson 6.4.2 > Problem 6-149

6-149.

Recall that , use the derivative of the inverse to find

.

is another way of saying that

*and*

*are inverse functions.*

Inverse functions have reciprocal derivatives at their corresponding

If has coordinate point

And

And if

*is the inverse of*

*, then*

Let and

*.*

First find

*_____. (This should be easy!)*

To find , take the reciprocal of

*, but NOT at the*

*-value...*

Now evaluate when

*.*