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[" 1.If "cos(1-i)=a+ib," where "a,b in R...

[" 1.If "cos(1-i)=a+ib," where "a,b in R" and "i=sqrt(-1)" ,then "],[[" (a) "a=(1)/(2)(e-(1)/(e))cos1,b=(1)/(2)(e+(1)/(e))sin1,]]

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