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[" 140.If "sin^(-1)x+tan^(-1)x=pi/2" ,th...

[" 140.If "sin^(-1)x+tan^(-1)x=pi/2" ,then "2x^(2)+1=],[[" a."sqrt(5)," b."(sqrt(5)-1)/(2)," c."2," d."(sqrt(5)+1)/(2)]]

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