Q. Find the derivative of the following function.y=ln(4x5)Answer: y′=
Apply Chain Rule: Apply the chain rule for differentiation.The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.For the function y=ln(4x5), the outer function is ln(u) and the inner function is u=4x5.First, we find the derivative of the outer function with respect to its argument u, which is 1/u.Then, we will find the derivative of the inner function with respect to x, which is the derivative of 4x5.
Differentiate Inner Function: Differentiate the inner function 4x5. Using the power rule, the derivative of xn with respect to x is n∗xn−1. Therefore, the derivative of 4x5 with respect to x is 5∗4x4 or 20x4.
Combine Derivatives: Combine the derivatives using the chain rule.The derivative of y with respect to x is the derivative of the outer function times the derivative of the inner function.So, y′=u1×(20x4), where u=4x5.
Substitute Back: Substitute u back into the derivative.Replace u with 4x5 in the expression for y′.y′=4x51⋅(20x4)
Simplify Expression: Simplify the expression.We can simplify the expression by canceling out x4 from the numerator and denominator.y′=4x520x4=4x20=x5
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