Algebra
Euler's formula
e^(iθ) = cos θ + i sin θ, unifying exponential and trigonometric functions; the special case e^(iπ)+1 = 0 is the cornerstone of complex analysis and many identity proofs.
0
Contest appearances
100
Practice problems
1–10
Difficulty levels
Drill this topic
Sign in and tell the coach to drill this knowledge point — it picks questions matched to your current level.