6.1.2 Finding the Derivative Implicitly Flashcards Preview

AP Calculus AB > 6.1.2 Finding the Derivative Implicitly > Flashcards

Flashcards in 6.1.2 Finding the Derivative Implicitly Deck (14):
1

Finding the Derivative Implicitly

• Leibniz notation is another way of writing derivatives. This notation will be helpful when finding the derivatives of relations that are not functions.
• Implicit differentiation uses the chain rule in a creative way to find the derivative of functions in implicit form.

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note

- Leibniz notation is another way of writing derivatives.
- Notice that Leibniz notation can work like an operation,
instructing you to find the derivative of something.
- An explicit equation is an equation in which one of the
variables is equal to an expression made up of the other
variable. The equation is explicitly defined in terms of the second variable.
- Explicit equations usually describe functions.
- An implicit equation is not organized nicely like an explicit equation. To find the derivative of an implicit equation, you can either solve the equation for one of the variables (putting it in explicit form) or you can use implicit differentiation.
- Start by taking the derivative of each side of the implicit
equation with respect to one of the variables. Work each
term piece by piece.
- When you encounter a term with a variable different from the one you are differentiating with respect to, treat that variable like a blop and use the chain rule.
- After you have differentiated each piece, isolate the
dy/dx-term.
- Notice that the derivative of y with respect to x is an
expression containing both x and y. When using the
derivative, it is important to substitute both the x-value and the y-value into the expression.

3

Given the equation cos^2x+cos^2y=cos^25π, find dy/dx.

dy/dx=−sin x cos x/sin y cos y

4

Given the equation
tan^2x^2−tan^2y^2=sec5√π,find dx/dy.

dx/dy=y tan y^2 sec^2 y^2/x tan x^2 sec^2 x^2

5

Given the equation x+y=0,find dy/dx.

dy/dx=−1

6

Given the equation s^2−t^2=16,find ds/dt.

ds/dt=t/s

7

Given the equation 2x+4y=8,find dy/dx.

dy/dx=−1/2

8

Given the equation x^2+y^2=9,find dy/dx.

dy/dx=−x/y

9

Given the equation 3x^2+4y^3=7,find dy/dx.

dy/dx=−x/2y^2

10

Suppose a curve is defined by the equation (x + y)^2 = 4. What is the equation of the line tangent to the curve at (3, −1)?

y = −x + 2

11

Given the equation x−1−lny=8, find dy/dx.

dy/dx=−y/x^2

12

Given the equation x+3y=1,find dy/dx.

dy/dx=−1/3

13

Suppose a curve is defined by the equation 3xy+2(xy)^2+xy^3=1. Find dy/dx.

dy/dx=−3y+4xy^2+y^3/3x+4x^2y+3xy^2

14

Given the equation sinx^2+siny^2=5,find dy/dx.

dy/dx=−xcosx^2/ycosy^2

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