If the complex numbers is (1+ri)^(3)=lam...

If the complex numbers is `(1+ri)^(3)=lambda(1+i)`, when `i=sqrt(-1)`, for some real `lambda`, the value of r can be

A

`cos""pi/5`

B

`cosec""(3pi)/2`

C

`cot""pi/12`

D

`tan""pi/12`

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The correct Answer is:

B, C, D

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