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[" 11.Let "f(n)=2cos nx" ,Vne "N" ,then ...

[" 11.Let "f(n)=2cos nx" ,Vne "N" ,then "],[f(1)f(n+1)-f(n)" is equal to "],[[" 1) "f(n+3)," 2) "f(n+2)],[" 3) "f(n+1)f(2)," 4) "f(n+2)f(2)]]

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