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     EduGorilla 
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     If f(x + 2y, x – 2y) = xy, then f(x, y) is equal to

    Options :-

    1. 1/4 xy
    2. 1/4 (x2 - y2)

    3. 1/8 (x2 - y2)

    4. 1/2 (x2 + y2)

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