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Answer: Option D
:
D
Option (d)Assume t= 2The question changes to[(5-√3i)(5+√3i)]/4 [25-(√3i)²]/4, since (a-b)(a+b)=a²-b²(25+3)/4, since i²=-1=7Only answer option (d) gives 7 on substitution of t=2

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