Show that the sequence ` (p + q)^(2), (p^(2) + q^(2)), (p-q)^(2) …` is an A.P.

Explanation

To show that the sequence \( (p + q)^2, p^2 + q^2, (p - q)^2 \) is an arithmetic progression (A.P.), we need to verify that the common difference between consecutive terms is the same.

### Step-by-Step Solution:

1. **Identify the Terms**:
- First term \( a_1 = (p + q)^2 \)
- Second term \( a_2 = p^2 + q^2 \)
- Third term \( a_3 = (p - q)^2 \)
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