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प्रश्न
Choose the correct alternative:
If f(x, y) = exy, then `(del^2"f")/(delxdely)` is equal to
विकल्प
xy exy
(1 + xy)exy
(1 + y) exy
(1 + x)exy
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उत्तर
(1 + xy)exy
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