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6-142.

Recall that . Use the formula for the derivative of an inverse to compute . Homework Help ✎

is another way of saying that and are inverse functions.
Inverse functions have reciprocal derivatives at their corresponding -values.

If has the coordinate point ,

and is the inverse of , then

Let and .
First find _____.

To find , take the reciprocal of, but NOT at the
x-value.

Now evaluate when .