(7) .
(8) .
(9) .
(10) .
(11) .
(12) .
(13) .
(14) .
(15) .
(16) .
(17) .
(18) .
Differential of an Inverse functions.
Consider the function (see p. 14) ; it can be expressed in the form ; this latter form is called the inverse function to the one originally given.
If , ; if , , and we see that
.
Consider , ; the inverse function is
.