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1 May, 05:55

Write the complex number in polar form. Express the argument in degrees. 4i

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  1. 1 May, 08:29
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    Write 4i in the following form r (cos Ф + I sin Ф)

    Since it's 4i, that means 4 is on the y-axis, So r = 4 and Ф = 90°

    Hence the equation is 4 (cos 90° + i sin 90°)

    Proof: cos 90° = 0 and sin 90° = 1

    4[0 + i (1) ] = 4i
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