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If (pi)/(2) lt alpha lt (3pi)/(2), the m...

If `(pi)/(2) lt alpha lt (3pi)/(2)`, the modulus and argument form of `(1+cos2alpha)+isin2alpha` is

A

`-2cosalpha{cos(pi+alpha)+isin(pi+alpha)}`

B

`2cosalpha{cosalpha+isinalpha}`

C

`2cosalpha{cos(-alpha)+isin(-alpha)}`

D

`-2cosalpha{cos(pi-alpha)+isin(pi-alpha)}`

Text Solution

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The correct Answer is:
A
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