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Mathematics
If ( √(1 + x) + √(1 − x) ) / ( √(1 + x) − √(1 − x) ) = a/b , then x equals : (a) a^2/(a^2 + b^2) (b) b^2/(a^2 + b^2) (c) ab/(a^2 + b^2) (d) 2ab/(a^2 + b^2)
Ratio Proportion
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