6. \( \int\left(1-e^{x}\right)^{2} d x \)
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To tackle the integral \( \int\left(1-e^{x}\right)^{2} d x \), you can expand the integrand first. This gives: \[ (1 - e^x)^2 = 1 - 2e^x + e^{2x}. \] Now, you can integrate term by term: \[ \int(1 - 2e^x + e^{2x}) \, dx = \int 1 \, dx - 2 \int e^x \, dx + \int e^{2x} \, dx. \] Integrating each of these results in: \[ x - 2e^x + \frac{1}{2}e^{2x} + C, \] where \( C \) is the constant of integration. Thus, the final answer is: \[ \int\left(1-e^{x}\right)^2 dx = x - 2e^{x} + \frac{1}{2}e^{2x} + C. \]