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[" (2) If "cos(2sin^(-1)x)=(1)/(9)," the...

[" (2) If "cos(2sin^(-1)x)=(1)/(9)," the "x=," (1) "+-(2)/(3)],[[" (a) "(2)/(3)," (b) "-(2)/(3)," (c) "+-(2)/(3)]]

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