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[" 16.If "cos^(-1)x+cos^(-1)y=(pi)/(2)" ...

[" 16.If "cos^(-1)x+cos^(-1)y=(pi)/(2)" and "tan^(-1)x-tan^(-1)y=0" ,then "x^(2)+xy+y^(2)" is equal to "],[[" 1) "0," 2) "(1)/(sqrt(2))," 3) "(3)/(2)," 4) "(1)/(8)]]

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