- r = θ, (double) spiral of Archimedes
- rθ = a (θ > 0), hyperbolic (or reciprocal) spiral
EXPONENTIAL AND LOGARITHMIC FUNCTIONS
PROPERTIES
INVERSE PROPERTIES
f (x) = ex and f −1(x) = ln x are inverses of each other:
f −1(f (x)) = f (f −1(x)) = x;
ln ex = eln x = x(x > 0).
GRAPHS