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81. if secx=4xy/(x+y) holds for some pair (x, y), then how many pairs (x, y) are possible, x, y being real and x≠ y ?

Answer» 81. if secx=4xy/(x+y) holds for some pair (x, y), then how many pairs (x, y) are possible, x, y being real and x≠ y ?


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