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JEE Mains · Maths · STD 12 - 8. Application and integration

વક્રો \(y=\mathrm{e}^x, y=\left|\mathrm{e}^x-1\right|\) અને \(y\)-અક્ષ દ્વારા ઘેરાયેલા પ્રદેશનું ક્ષેત્રફળ ___ છે.

  1. A \(1-\log _{\mathrm{e}} 2\)
  2. B \(\log _{\mathrm{e}} 2\)
  3. C \(1+\log _e 2\)
  4. D \(2 \log _e 2-1\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1-\log _{\mathrm{e}} 2\)

Step-by-step Solution

Detailed explanation

\begin{aligned} & e^x=1-e^x \Rightarrow 2 e^x=1 \\ & \Rightarrow e^x=\frac{1}{2} \\ & \Rightarrow x=\ln \frac{1}{2} \\ & \int_{\ln (1 / 2)}^0\left[e^x-\left(1-e^x\right)\right] d x \\ & =\int_{\ln 2}^0\left(2 e^x-1\right) d x=2 e^x-\left.x\right|_{-\ln 2} ^0 \\ & =2-(1+\ln 2) \\…

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