Apply Chain Rule for ln(u): Apply the chain rule to the logarithmic function.The derivative of ln(u) is u1⋅dxdu, where u is a function of x. In this case, u=(x+12x)3.
Differentiate Inside Function u: Differentiate the inside function u=(x+12x)3. To differentiate u, we will use the chain rule again, since u is a composition of two functions: the cube function and the division of 2x by x+1.
Differentiate Cube Function: Differentiate the cube function.The derivative of v3 with respect to v is 3v2. Let v=x+12x, then the derivative of v3 with respect to x is 3v2⋅dxdv.
Differentiate v=x+12x: Differentiate v=x+12x. To differentiate v, we will use the quotient rule: uv′−u2vu′, where v=2x and u=x+1. The derivative of 2x is 2, and the derivative of x+1 is 1.
Apply Quotient Rule for dv/dx: Apply the quotient rule to find dv/dx. dv/dx=(x+1)22∗(x+1)−2x∗1=(x+1)22x+2−2x=(x+1)22.
Combine Results from Step 3 and Step 5: Combine the results from Step 3 and Step 5.The derivative of u with respect to x is 3v2⋅dxdv=3(x+12x)2⋅(x+1)22.
Simplify Expression for dxdu: Simplify the expression for dxdu.3(x+12x)2×(x+1)22=3((x+1)24x2)×(x+1)22=(x+1)424x2.
Apply Chain Rule for f(x): Apply the chain rule to find the derivative of f(x). The derivative of f(x) with respect to x is u1⋅dxdu=(x+12x)31⋅(x+1)424x2.
Simplify Expression for f′(x): Simplify the expression for f′(x).(x+12x)31×(x+1)424x2=(2x)324x2×x+11=8x324x2×x+11.
Further Simplify f′(x): Further simplify the expression for f′(x).8x324x2⋅x+11=x3⋅x+11=x(x+1)3.
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