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[" 7.If "a=cos theta+i sin theta," then ...

[" 7.If "a=cos theta+i sin theta," then "(1+a)/(1-a)=],[[" (a) "cot theta," (b) "cot(theta)/(2)],[" (c) "i cot(theta)/(2)," (d) "i tan(theta)/(2)]]

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