1. **State the problem:** Evaluate the expression $$(1 - j)^3$$ where $j$ is the imaginary unit with the property $j^2 = -1$.
2. **Recall the binomial expansion formula:** For any complex numbers $a$ and $b$, $$(a + b)^3 = a^3 + 3a^2b + 3ab^2 + b^3$$
3. **Apply the formula:** Let $a = 1$ and $b = -j$, then
$$ (1 - j)^3 = 1^3 + 3(1)^2(-j) + 3(1)(-j)^2 + (-j)^3 $$
4. **Calculate each term:**
- $1^3 = 1$
- $3(1)^2(-j) = 3 imes 1 imes (-j) = -3j$
- $3(1)(-j)^2 = 3 imes 1 imes (-j)^2$
Since $(-j)^2 = (-1)^2 imes j^2 = 1 imes (-1) = -1$, so
$$3 imes 1 imes (-1) = -3$$
- $(-j)^3 = (-j) imes (-j)^2 = (-j) imes (-1) = j$
5. **Sum all terms:**
$$1 - 3j - 3 + j = (1 - 3) + (-3j + j) = -2 - 2j$$
6. **Final answer:**
$$(1 - j)^3 = -2 - 2j$$
7. **Check options:** None of the options exactly match $-2 - 2j$, so the correct evaluation is $-2 - 2j$ which is not listed among the options.
Complex Cube 45D1E7
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