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[" 7.The trigonometric equation "sin^(-1...

[" 7.The trigonometric equation "sin^(-1)x=2sin^(-1)a" ,has a solution for "],[[" (a) all real values "," (b) "|a|<=(1)/(sqrt(2))],[" (c) "|a|>=(1)/(sqrt(2))," (d) "(1)/(2)<|a|<(1)/(sqrt(2))]]

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