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[" 1) "],[" 9.The equation "4Sin^(2)x+4S...

[" 1) "],[" 9.The equation "4Sin^(2)x+4Sinx+a^(2)-3=0],[" has a solution if "],[[" 1) "-2<=a<=2," 2) "-1<=a<=1],[" 3) "-3<=a<=3," 4) "-4<=a<=4]]

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