Calculus AB
Calculus AB
Chapter 4
More Derivatives
AP Classroom
2.7, 3.2, 3.3, 3.4
R7/8, R9, R10
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2
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4.2 Implicit Differentiation
AP: 3.2
When you need to find the derivative of a function given implicitly, it is not necessary to
solve the equation for y in terms of x.
Instead, we use the method called implicit differentiation. It consists of 3 steps:
1) Differentiate both sides of the equation with respect to x. When you take the
derivative of a term that includes y, think of y as y(x) and apply the Chain Rule
dy
(multiply by
or , y? )
dx
2) Collect the terms with y? on one side of the equation and the terms without it on the
other side.
3) Solve for y?
Example 1
Differentiate x2 - xy + y2 = 21
3
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Example 2
Determine the slope of the tangent line to the circle x2 + y2 = 13 at the point (2,3)
Example 3
Write the equation of the tangent line to the curve x 2 cos 2 y ? sin y = 0 at the point (0, ? )
Read Example 5 on page 165
Assign p. 167
numbers 1 - 19 (odd`s only), 23, 33, 35
4
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4.3 Part 1 Derivatives of Inverse Functions
AP: 3.3
A function is said to be one-to-one if, for each output there is a single input.
y
y
10
10
5
5
- 10
-5
5
10
x
- 10
-5
5
-5
-5
- 10
- 10
one-to-one
10
x
not one-to-one
A function must be one-to-one to have an inverse that is a function.
Theorem:
Let
Then
be a one to one continuous function on an interval .
is strictly increasing or decreasing.
5
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