Q. Find the derivative of the following function.y=ln(3x4)Answer: y′=
Identify function: Identify the function to differentiate.We have y=ln(3x4). We need to find the derivative of this function with respect to x.
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. Here, the outer function is ln(u) and the inner function is u=3x4.
Differentiate outer function: Differentiate the outer function.The derivative of ln(u) with respect to u is u1. So, if y=ln(u), then y′=u1.
Differentiate inner function: Differentiate the inner function.The inner function is u=3x4. The derivative of u with respect to x is u′=dxd(3x4)=3⋅dxd(x4)=3⋅4x3=12x3.
Apply chain rule: Apply the chain rule.Using the chain rule, the derivative of y with respect to x is y′=(1/u)⋅(du/dx). Substituting u=3x4 and du/dx=12x3, we get y′=(1/(3x4))⋅(12x3).
Simplify expression: Simplify the expression.Simplify y′ by canceling out common factors. The x3 in the numerator and denominator cancel out, and we are left with y′=3x12=x4.
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