GRE Problem Solving Question 220
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Source: Monkey
The operation ⊙ is defined for all real numbers x and y by the equation x ⊙y = x^2 + y^2 -xy. Each of the following must be true EXCEPT
- A x⊙x=x^2
- B x⊙y=y⊙x
- C x⊙1=x
- D x⊙0=x^2
- E x⊙y=(-x)⊙(-y)