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[" 28.If "sin^(-1)x=(pi)/(5)" for some "...

[" 28.If "sin^(-1)x=(pi)/(5)" for some "x in(-1,1)],[" then the value of "cos^(-1)x" is: "],[" (a) "(3 pi)/(10)" (b) "(5 pi)/(10)" (c) "(7 pi)/(10)" (d) "(9 pi)/(10)]

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