3.6 Derivatives of Inverse Functions - Arlington Public Schools
[Pages:14]3.6 Derivatives of Inverse Functions
Derivative of an Inverse Function
Let be a function that is differentiable on an interval .
If has an inverse function , then is differentiable at
any for which
. Moreover,
,
1
Example 1) Let a. What is the value of
when
?
b. Hence, what is the value of
when
?
2
Multiple Choice:
Example 2) Let be the function defined by
.
If
and
, what is the value of
?
[A]
[B]
[C]
[D]
[E]
3
Derivatives of Inverse Trig Functions
y = arcsin x y = arccos x y = arctan x y = arccot x y = arcsec x y = arccsc x
These can be written as y = sin-1x rather than y = arcsinx
sin-1x does NOT mean 1 sinx
4
Example 3: Evaluate the derivative of sin y = x 5
Example 4: Evaluate the derivative of cos y = x 6
MUST MEMORIZE!
These formulas are on page 177 in your books.
7
Example 5: Find the derivative of: y = sin-1 (1- t)
8
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