Preference

Question:

(2uv)2 + (u2 - v2)2 =?

  1. a.

    2uv

  2. b.

    (u2 + v2)2

  3. c.

    u2 + v2

  4. d.

    (2uv)2 + (u2 + v2)2

Answer: b
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