Tran Zimmerman
02/21/2023 · High School

Find the value of \( \int \log _{e} x \cdot d x \)

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Calculate the integral \( \int \log _{e} x \cdot d x \). Evaluate the integral by following steps: - step0: Evaluate using partial integration formula: \(\int \ln{\left(x\right)} dx\) - step1: Prepare for integration by parts: \(\begin{align}&u=\ln{\left(x\right)}\\&dv=dx\end{align}\) - step2: Calculate the derivative: \(\begin{align}&du=\frac{1}{x}dx\\&dv=dx\end{align}\) - step3: Evaluate the integral: \(\begin{align}&du=\frac{1}{x}dx\\&v=x\end{align}\) - step4: Substitute the values into formula: \(\ln{\left(x\right)}\times x-\int \frac{1}{x}\times x dx\) - step5: Calculate: \(x\ln{\left(x\right)}-\int 1 dx\) - step6: Evaluate the integral: \(x\ln{\left(x\right)}-x\) - step7: Add the constant of integral C: \(x\ln{\left(x\right)}-x + C, C \in \mathbb{R}\) The value of \( \int \log _{e} x \cdot d x \) is \( x\ln{(x)}-x + C \), where \( C \) is an arbitrary constant.

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\( x\ln{(x)}-x + C \)
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