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[" If "cos^(-1)(2x^(2)-1)=2 pi-2cos^(-1)...

[" If "cos^(-1)(2x^(2)-1)=2 pi-2cos^(-1)x," then "=],[[" (A) "x in[-1,0]," (B) "x in[0,1]," (C) "x in[0,(1)/(sqrt(2))]," (D) "x in[-(1)/(sqrt(2))]]

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