  Closed form expressions to calculate the exponential of a general multivector
(MV) in Clifford geometric algebras (GAs) Cl(p,q) are presented for n=p+q=3.
The obtained exponential formulas were applied to find exact GA trigonometric
and hyperbolic functions of MV argument. We have verified that the presented
exact formulas are in accord with series expansion of MV hyperbolic and
trigonometric functions. The exponentials may be applied to solve GA
differential equations, in signal and image processing, automatic control and
robotics.
