Rotation About Origin (z' = z · e^(iα))

jee-mainjee-advanced

z' = z · e^(iα)

What each symbol means

SymbolWhat it stands for
zOriginal complex number (point)
z'Image after rotation
αAngle of counterclockwise rotation about origin (radians)

When to use this

Rotation about origin; |z'| = |z|. For rotation about z₀: z' − z₀ = (z − z₀)e^(iα).