Implicit derivative of function, calc 3

In summary, implicit differentiation is a method used to find the derivative of a function that is not explicitly written in the form y = f(x). It involves using the chain rule and product rule to differentiate both sides of the equation with respect to the independent variable. The purpose of finding the implicit derivative is to determine the slope of a curve at any point, even if the function cannot be easily solved for y. This method can also be used to find higher order derivatives and in optimization problems. However, it does have limitations, such as only being applicable to functions that can be differentiated using the chain rule and product rule, and cannot be used for non-continuous or non-differentiable functions.
  • #1
tnutty
326
1

Homework Statement




Find dy/dx ;

sqrt(xy) = 1 + yx^2
or
0 = 1 + yx^2 - sqrt(xy)

Definition :

dy/dx = - F_x / F_y;

A = F_x = 2xy - 1/2 (xy)^-0.5 * y
B = F_y = x^2 - 1/2(xy)^-0.5 * x

Then dy/dx = -A / B

But the answer according to the book, is this :

4(xy)^-1.5 - y
--------------
x - 2x^2/(sqrt(xy))
 
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  • #2
They just multiplied numerator and denominator by 2*sqrt(xy).
 

1. What is the concept of implicit differentiation?

Implicit differentiation is a method used to find the derivative of a function that is not explicitly written in the form y = f(x). It is used when the equation contains both independent and dependent variables and cannot be easily solved for y.

2. How is the implicit derivative of a function calculated?

To find the implicit derivative of a function, we use the chain rule and the product rule. We treat the dependent variable as a function of the independent variable and differentiate both sides of the equation with respect to the independent variable.

3. What is the purpose of finding the implicit derivative?

The implicit derivative allows us to find the slope of a curve at any point, even if the function cannot be easily solved for y. It is also useful in finding higher order derivatives and in optimization problems.

4. Can the implicit derivative be used to find the slope of a tangent line?

Yes, the implicit derivative gives us the slope of the tangent line at any point on the curve. We can plug in the x and y coordinates of the point into the derivative to find the slope of the tangent line.

5. Are there any limitations to using implicit differentiation?

Implicit differentiation can only be used for functions that can be differentiated with the chain rule and product rule. It also cannot be used for functions that are not continuous or differentiable.

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