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University Math Lab: Systems & Structures FREE

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Euler's Formula & Complex Exponentials

60 min University Math Lab: Systems & Structures

Learning Objectives

  • Apply Euler's formula
  • Express complex numbers in exponential form
  • Derive trig identities

Key Concepts

Euler's Formula

e^(iθ) = cos(θ) + i·sin(θ)

Euler's Identity

e^(iπ) + 1 = 0

Theory

**Euler's Formula:** e^(iθ) = cos(θ) + i·sin(θ) **Consequences:** - cos(θ) = (e^(iθ) + e^(-iθ))/2 - sin(θ) = (e^(iθ) - e^(-iθ))/(2i) - |e^(iθ)| = 1 for all θ **Euler's Identity:** e^(iπ) + 1 = 0 (connects e, i, π, 1, 0) **Complex exponential:** z = re^(iθ) is the polar form of z.

Examples

Express 1+i in exponential form

Solution: |z| = √2, θ = π/4. So z = √2·e^(iπ/4)