English

State true or false for the following: The argument of the complex number z = (1+i3)(1+i)(cosθ+isinθ) is 7π12+θ.

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Question

State true or false for the following:

The argument of the complex number z = `(1 + i sqrt(3))(1 + i)(cos theta + i sin theta)` is `(7pi)/12 + theta`.

Options

  • True

  • False

MCQ
True or False
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Solution

This statement is True.

Explanation:

arg(z) = arg`(1 + i sqrt(3))` + arg(1 + i) + arg(cosθ + isinθ)

`pi/3 + pi/4 + theta`

= `(7pi)/12 + theta`

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Chapter 5: Complex Numbers and Quadratic Equations - Solved Examples [Page 85]

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NCERT Exemplar Mathematics Exemplar [English] Class 11
Chapter 5 Complex Numbers and Quadratic Equations
Solved Examples | Q 17.(iv) | Page 85

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