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[" 18.Let "S" be the set of all "alpha i...

[" 18.Let "S" be the set of all "alpha in R" such that the "],[" equation,"cos2x+alpha sin x=2 alpha-7" has a solution."],[" Then "S" is equal to : "],[[" (1) "[2,6]," (2) "[3,7]],[" (3) "R," (4) "[1,4]]]

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