Q. Find the derivative of the following function.y=ln(4x4)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 y=ln(4x4), the outer function is ln(u) and the inner function is u=4x4.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 4x4.
Differentiate Inner Function: Differentiate the inner function 4x4 with respect to x. Using the power rule, which states that the derivative of xn with respect to x is n∗x(n−1), we differentiate 4x4. The derivative of 4x4 with respect to x is 4×4x3=16x3.
Combine Derivatives: Combine the derivatives of the outer and inner functions 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×(16x3), where u=4x4.
Substitute u: Substitute u back into the derivative.Since u=4x4, we substitute it back into the expression for y′.y′=4x41×(16x3).
Simplify Expression: Simplify the expression.We can simplify the expression by canceling out common factors.y′=4x416x3=x44x3.
Cancel x Terms: Simplify the expression further by canceling x terms.When dividing powers with the same base, we subtract the exponents.y′=x4−34=x4.
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