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

[" 7.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," (d) "4 pi/5]]

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