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Question

Real part of eeiθ is

A
ecosθ[cos(sinθ)]
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B
ecosθ[cos(cosθ)]
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C
esinθ[sin(cosθ)]
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D
esinθ[sin(sinθ)]
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Solution

The correct option is A ecosθ[cos(sinθ)]
eeiθ=ecosθ+isinθ=ecosθ(eisinθ)

ecosθ(eisinθ)=ecosθ(cossinθ)+iecosθ(sinsinθ)

The real part is ecosθ(cossinθ)

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