Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

If , then write the value of x + y + xy.

Given tan^{-1} x + tan^{-1} y =π/4

We know that

⇒ x + y = 1 – xy

⇒ x + y + xy = 1

∴ x + y + xy = 1

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