COMEDK Exam 2012 Solved Paper

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Question : 159 of 180

Marks: +1, -0

If a=cos‌2‌α+isin‌2α,b=cos‌2‌β+isin‌2β, then √‌

a

b

+√‌

b

a

=

2 isin (α−β)
2isin‌(α+β)
2‌cos(α+β)
2‌cos(α−β)

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