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1988

JEE Main 1988 Mathematics question on Complex Numbers and Quadratic Equations

The complex numbers sin⁡x+icos⁡2x\sin x + i \cos 2x and cos⁡x−isin⁡2x\cos x - i \sin 2x are conjugate to each other, for
  1. A.
    x=nπx = n\pi
  2. B.
    x=0x = 0
  3. C.
    x=(n+1/2)πx = (n + 1/2)\pi
  4. D.
    no value of xx
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Correct option: D

[1988]

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