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[" 15.Let "f(x)=e^(cos^(-1)(sin(x+pi/3))...

[" 15.Let "f(x)=e^(cos^(-1)(sin(x+pi/3))!)" .Then,"f(8 pi/9)=],[[" (a) "e^(5 pi/18)," (b) "e^(13 pi/18)," (c) "e^(-2 pi/18)," (d) "]]

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