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Calculation of Complex Numbers in Senior High School Mathematics
Solution: Let Z 1=cosA+isinA, then Z2 =-COSA+(2-SINA) i.

z 1-Z2 = 2co sa+2(sinA- 1)I

丨 Z 1-Z2 丨 = under the radical sign ((4cos 2a+4 (Sina- 1) 2))

This is a trigonometric function with a maximum value of 4.

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