GCEFurther MathematicsIntegration2023

Evaluate $\int_{1}^{e} \frac{\ln x}{x}\, dx$

A1
B$\frac{1}{2}$CORRECT
C$e$
D0
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Toaster Teacher
Why the answer is B, and why the others tempt you.
Let u = ln x, then du = dx/x. The integral becomes ∫₀¹ u du = [u²/2]₀¹ = 1/2 - 0 = 1/2. When x = 1, u = 0; when x = e, u = 1. The answer is 1/2.
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