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[" 2"t" cos "(sin^(-1)(2)/(sqrt(5))+cos^...

[" 2"t" cos "(sin^(-1)(2)/(sqrt(5))+cos^(-1)x)=0" ,then "x" is equal to "],[[" (1) "(1)/(sqrt(5))," (8) "-(2)/(sqrt(5))," (C) "(2)/(sqrt(5))," (D) "1]]

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