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Tamil Nadu Board of Secondary EducationHSC Science Class 12

If z = 2 – 2i, find the rotation of z by θ radians in the counterclockwise direction about the origin when θ = 3π3 - Mathematics

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Question

If z = 2 – 2i, find the rotation of z by θ radians in the counterclockwise direction about the origin when θ = `(3pi)/3`

Sum
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Solution

θ = `(3pi)/3`

∴ Argument = `(3pi)/2 - pi/4`

= `(5pi)/4`

∴ New position is `2sqrt(2) (cos  (5pi)/4 + "i" sin  (5pi)/4)`

= `2sqrt(2) "e"^((15pi)/4)`

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de Moivre’s Theorem and Its Applications
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Chapter 2: Complex Numbers - Exercise 2.8 [Page 92]

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Samacheer Kalvi Mathematics - Volume 1 and 2 [English] Class 12 TN Board
Chapter 2 Complex Numbers
Exercise 2.8 | Q 9. (iii) | Page 92
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