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[" (c) "2],[" 7.For the equation "cos^(-...

[" (c) "2],[" 7.For the equation "cos^(-1)x+cos^(-1)2x+pi=0" ,the number of "],[" real solutions is "],[[" (a) "1," (b) "2],[" (c) "0," (d) "oo]]

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