Part 1 : √(-1) Is Impossible? Introduction to iota & Complex Numbers. Real Numbers are also Complex Number

Part 2 : Complex Numbers Make Trigonometry Easy! | Euler's Formula Proves Sin(A+B) & Cos(A+B)

Pat 3 : 🔥 Why Powers of i Repeat Every 4 Terms? Why 𝑖 + 𝑖² + 𝑖³ + 𝑖⁴ = 0  ? 𝑖³⁶⁹⁷  = ?