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[" 37.If "sin^(-1)((2a)/(1+a^(2)))+sin^(...

[" 37.If "sin^(-1)((2a)/(1+a^(2)))+sin^(-1)((2b)/(1+b^(2)))=2tan^(-1)x" ,then "x=],[[" (a) "(a-b)/(1+ab)," (b) "(b)/(1+ab)],[" (c) "(b)/(1-ab)," (d) "(a+b)/(1-ab)]]

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