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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 values.

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 .