The chain rule applications Logarithmic differentiation
Logarithmic differentiation examples Derivative of a composite exponential function
Use of the logarithmic differentiation
Derivatives of composite functions examples
Logarithmic differentiation
The derivative of the logarithm of a function  yf (x) is called the logarithmic derivative of the function, thus Therefore, the logarithmic derivative is the derivative of the logarithm of a given function.
Logarithmic differentiation examples
Example:   Find the derivative of the function   f (x) = ln (sin x).
 Solution: Example:   Find the derivative of the function   f (x) = ln (cos x).
 Solution: Example:   Find the logarithmic derivative of the function Solution:   Since the logarithm of the given function then differentiating both the left and the right side of the above expression, obtained is Derivative of a composite exponential function
We use the logarithmic differentiation to find derivative of a composite exponential function of the form, where u and v are functions of the variable x and u > 0.
By taking logarithms of both sides of the given exponential expression we obtain,
ln y = v ln u.
Differentiating both sides of the above equation with respect to x  Use of the logarithmic differentiation
Derivatives of composite functions examples
 Example:   Find the derivative of the function Solution: by differentiating both sides of the above equation we get or Example:   Find the derivative of the function Solution: by differentiating both sides of the above equation we get Example:   Find the derivative of the function Solution: by differentiating both sides of the right equation above, we get Example:   Find the derivative of the function Solution: by differentiating both sides of the above equation we get    Calculus contents C 