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17 May, 16:18

Write the complex equation 8 + 3i in trigonometric form

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  1. 17 May, 16:28
    0
    z = 8.544[cos (20.6) + isin (20.6) }

    Step-by-step explanation:

    Given

    8 + 3i

    Required

    Rewrite in trigonometric form.

    The trigonometric form of a complex equation is

    z = r[cosθ + isinθ]

    Let a = 3 and b = 8

    Where

    r is calculated by

    r² = b² + a²

    And

    θ is calculated by

    θ = arctan (a/b)

    Substituting 3 for a and 8 for b

    r² = a² + b² becomes

    r² = 3² + 8²

    r² = 9 + 64

    r² = 73

    √r² = √73

    r = √73

    r = 8.544

    Calculating θ

    θ = arctan (a/b) becomes

    θ = arctan (3/8)

    θ = arctan (0.375)

    θ = 20.556°

    θ = 20.6 - - - Approximated

    Hence, z = r[cosθ + isinθ] becomes

    z = 8.544[cos (20.6) + isin (20.6) }
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