If z = 5(cos(θ) + i sin(θ)), what is the value of z when θ = π/3? (2023)

Practice Questions

Q1
If z = 5(cos(θ) + i sin(θ)), what is the value of z when θ = π/3? (2023)
  1. 5 + 5i
  2. 5 + 2.5i
  3. 2.5 + 5i
  4. 2.5 + 2.5i

Questions & Step-by-Step Solutions

If z = 5(cos(θ) + i sin(θ)), what is the value of z when θ = π/3? (2023)
  • Step 1: Identify the given formula for z, which is z = 5(cos(θ) + i sin(θ)).
  • Step 2: Substitute θ with π/3 in the formula: z = 5(cos(π/3) + i sin(π/3)).
  • Step 3: Find the value of cos(π/3). The value is 1/2.
  • Step 4: Find the value of sin(π/3). The value is √3/2.
  • Step 5: Substitute the values of cos(π/3) and sin(π/3) into the equation: z = 5(1/2 + i√3/2).
  • Step 6: Distribute the 5: z = 5 * (1/2) + 5 * (i√3/2).
  • Step 7: Calculate 5 * (1/2) = 2.5.
  • Step 8: Calculate 5 * (i√3/2) = (5i√3)/2.
  • Step 9: Combine the results: z = 2.5 + (5i√3)/2.
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