Mathematics · Algebra
Simplify the expression s 2 + t 2 + 2st - u 2 s 2 - t 2 - 2tu - u 2 , provided (s + t + u) ≠ 0.
- 1s - t + u s + t + u
- 2s - t - u s + t - u
- 3s + t + u s - t + u
- 4s + t - u s - t - u✓
Correct answer
s + t - u s - t - u
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