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[" 21.If "x+(1)/(x)=2cos alpha" ,then "x...

[" 21.If "x+(1)/(x)=2cos alpha" ,then "x^(n)+(1)/(x')],[[" (a) "2^(n)cos alpha," (b) "2^(n)cos],[" (c) "2" isinn "alpha," (d) "2cos]]

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