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[" 8.There exists a positive real number...

[" 8.There exists a positive real number "x" satisfying "cos(tan^(-1)x)=x" .The value of "cos^(-1)((x^(2))/(2))" is "],[[" (A) "(pi)/(10)," (B) "(pi)/(5)," (C) "(2 pi)/(5),(4 pi)/(5)]]

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