For all numbers x and y, the operation ? is defined by $x?y=(x+y)(x-y)+(y-x)(y+x)+xy$ .
What is the value of $\sqrt{12}? \sqrt{3}$ ?

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What this question tests

Your ability to evaluate and compose functions, including unusual defined operations.

Applying function operations in the wrong order or ignoring domain restrictions.

For all numbers x and y, the operation ? is defined by x?y=(x+y)(x−y)+(y−x)(y+x)+xyx?y=(x+y)(x-y)+(y-x)(y+x)+xyx?y=(x+y)(x−y)+(y−x)(y+x)+xy. What is the value of 12?3\sqrt{12}? \sqrt{3}12​?3​?