The expression is:

$(-2 - (-1))^2$

First, simplify inside the parentheses:

$-2 - (-1) = -2 + 1 = -1$

Now square the result:

$(-1)^2 = 1$

So, the final answer is:

$1$

Would you like any further details or have any questions?

Here are 5 related questions:

1. What is the result of $(-3 - (-2))^2$?
2. Can you simplify $(-5 - (-3))^2$?
3. How do you handle negative signs inside parentheses when subtracting?
4. What is the square of $(-2)^2$?
5. How does squaring a negative number affect the result?

Tip: Always simplify the expression inside parentheses before handling exponents.