JEE Main 2019 · 10 Jan · Shift II

JEE Main 2019 Mathematics question on Complex Numbers and Quadratic Equations

Let z=(32+i2)5+(32−i2)5z = \left(\dfrac{\sqrt{3}}{2} + \dfrac{i}{2}\right)^5 + \left(\dfrac{\sqrt{3}}{2} - \dfrac{i}{2}\right)^5. If R(z)R(z) and I(z)I(z) respectively denote the real and imaginary parts of zz, then
  1. A.
    R(z)>0R(z) > 0 and I(z)>0I(z) > 0
  2. B.
    I(z)=0I(z) = 0
  3. C.
    R(z)<0R(z) < 0 and I(z)>0I(z) > 0
  4. D.
    R(z)=−3R(z) = -3
Show answer

Correct option: B

[JEE Main 2019 · 10 Jan · Shift II]

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