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z = 3i

r=3

theta=taninverse(3/0)=undefine

as we know tan theta is undefine at 90 and 270....check through qustion ..their is + sign with imag part....its mean angle is 90

so we write it as

3(cos90 + isin90)

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11y ago
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Q: Write z equals 3i in abbreviated trigonometric form?
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