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Complex Numbers 2 Mark Creative Question Paper With Answer Key

12th Standard

    Reg.No. :
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Maths

Time : 00:30:00 Hrs
Total Marks : 30

    2 Marks

    15 x 2 = 30
  1. If z1 and z2 are two complex numbers, such that |z1| = Iz2|, then is it necessary that z1 = z2?

  2. Find Re (z) and im (z) if z = 5i11 + 7i3

  3. If (cosθ + i sinθ)2 = x + iy, then show that x2+y2 =1

  4. If z1 and z2 are 1-i, -2+4i then find Im\(\left( \frac { { z }_{ 1 }{ z }_{ 2 } }{ \bar { { z }_{ 1 } } } \right) \).

  5. If z =\(\left( \frac { \sqrt { 3 } }{ 2 } +\frac { i }{ 2 } \right) ^{ 107 }+\left( \frac { \sqrt { 3 } }{ 2 } -\frac { i }{ 2 } \right) ^{ 107 }\), then show that Im (z) = 0

  6. Find the value of the complex number (i25)3.

  7. If 1, ω, ω2 are the cube roots of unity show that (1+ω2)3 - (1+ω)3 = 0

  8. Find the argument of -2

  9. Find the modules of (1+ 3i)3

  10. Find the values of the real number x and y if 3x + (2x - 3y) i = 6 + 3i9.

  11. Find the value of \(i^{57}+\frac{1}{i^{125}}\)

  12. Evaluate 
    (i) i4n+1
    (ii) i3+i-3

  13. Simplify: \(\frac{1}{i}-\frac{i}{i^{2}}+\frac{1}{i^{3}}-\frac{1}{i^{4}}\)

  14. Simplify \(i^{2}+i^{4}+i^{6}+\ldots(2 n+1)\) terms.

  15. Find the values of x and y if 4x+ i(3x-y) = 3 - 6i

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