List questions from complex-numbers

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Express $\sin 3\theta$ and $\cos 3\theta$ as functions of $\sin \theta$ and $\cos \theta$ using Euler's identity

Published on 12 Apr 2026 - 12:37

2.5k

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The cross-ratio of four points is a real number exactly when the four points lie on a line or a circle

Published on 16 Apr 2026 - 5:32

69

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On a certain series of complex numbers

Published on 12 Apr 2026 - 6:04

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Evaluate complex number ratio

Published on 15 Apr 2026 - 17:04

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Choosing a branch of the square root

Published on 17 Apr 2026 - 10:10

100

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Solving $|z-3| \leq|z-1-i|$

Published on 15 Apr 2026 - 3:12

1.7k

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Is $\mathbb{C}$ equal to $\mathbb{R}^2$?

Published on 12 Apr 2026 - 18:56

194

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Quick complex number proof question:

Published on 11 Apr 2026 - 12:45

1.8k

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Find the cube roots of $ -8 i $ and plot them on a plane.

Published on 16 Apr 2026 - 0:34

719

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Square root of a squared number changes sign, which to apply first?

Published on 13 Apr 2026 - 19:53

96

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Complex Numbers: Im$(\frac{12}{z-7})=1$

Published on 15 Apr 2026 - 2:35

181

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Complex series radius convergence

Published on 15 Apr 2026 - 17:21

124

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Omitting $i$ in calculations

Published on 13 Apr 2026 - 7:04

18.1k

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2x2 inverse of a complex matrix with complex determinant

Published on 14 Apr 2026 - 13:19

145

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Motivational example for complex numbers

Published on 11 Apr 2026 - 8:59

List Question

Express $\sin 3\theta$ and $\cos 3\theta$ as functions of $\sin \theta$ and $\cos \theta$ using Euler's identity

The cross-ratio of four points is a real number exactly when the four points lie on a line or a circle

On a certain series of complex numbers

Evaluate complex number ratio

Choosing a branch of the square root

Solving $|z-3| \leq|z-1-i|$

Is $\mathbb{C}$ equal to $\mathbb{R}^2$?

Quick complex number proof question:

Find the cube roots of $ -8 i $ and plot them on a plane.

Square root of a squared number changes sign, which to apply first?

Complex Numbers: Im$(\frac{12}{z-7})=1$

Complex series radius convergence

Omitting $i$ in calculations

2x2 inverse of a complex matrix with complex determinant

Motivational example for complex numbers

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