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[" 50.If "sin^(-1)((2x)/(1+x^(2)))+cos^(...

[" 50.If "sin^(-1)((2x)/(1+x^(2)))+cos^(-1)((1-x^(2))/(1+x^(2)))=4tan^(-1)x" ,then "],[[" (a) "x in-(-oo,-1)," (b) "x in(1,oo)],[" (c) "x in[0,1]," (d) "x in[-1,0)]]

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