Q. Find the derivative of the following function.y=ln(4x2−3x)Answer: y′=
Identify Function: Identify the function to differentiate.We have y=ln(4x2−3x). This is a composition of two functions: the natural logarithm function and a quadratic function inside it.
Apply Chain Rule: Apply the chain rule for differentiation.The chain rule states that if you have a composite function y=f(g(x)), then the derivative y′ is f′(g(x))⋅g′(x). Here, f(u)=ln(u) and g(x)=4x2−3x.
Differentiate Outer Function: Differentiate the outer function f(u)=ln(u) with respect to u. The derivative of ln(u) with respect to u is 1/u. So, f′(u)=1/u.
Differentiate Inner Function: Differentiate the inner function g(x)=4x2−3x with respect to x. The derivative of 4x2 with respect to x is 8x, and the derivative of −3x with respect to x is −3. So, g′(x)=8x−3.
Apply Chain Rule with Derivatives: Apply the chain rule using the derivatives from steps 3 and 4.We have f′(u)=u1 and g′(x)=8x−3. Now, we substitute u with g(x) to get f′(g(x))=4x2−3x1. Then, we multiply f′(g(x)) by g′(x) to get the derivative of y with respect to x.y′=f′(g(x))⋅g′(x)=(4x2−3x1)⋅(8x−3).
Simplify Derivative: Simplify the expression for the derivative.y′=4x2−3x8x−3.This is the simplified form of the derivative.
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