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[" 175."cos^(-1){(1)/(2)x^(2)+sqrt(1-x^(2))sqrt(1-(x^(2))/(4))|}=cos^(-1)(x)/(2)-cos^(-1)x" holds "],[" for : "],[[" 1) "|x|<=1," 2) "x in R],[" 3) "0<=x<=1," 4) "-1<=x<=0]]

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cos^(-1){1/2x^(2)+sqrt(1+x^(2))sqrt(1-x^(2))/(4)}=cos^(-1)(x)/(2)-cos^(-1)x

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