  We report the observation of hole cyclotron resonance (CR) in
InMnAs/(Al,Ga)Sb heterostructures in a wide temperature range covering both the
paramagnetic and ferromagnetic phases. We observed two pronounced resonances
that exhibit drastic changes in position, linewidth, and intensity at a
temperature higher than the Curie temperature, indicating possible local
magnetic ordering or clustering. We attribute the two resonances to the
fundamental CR transitions expected for delocalized valence-band holes in the
quantum limt. Using an 8-band {\bf k$\cdot$p} model, which incorporates
ferromagnetism within a mean-field approximation, we show that the
temperature-dependent CR peak shift is a direct measure of the carrier-Mn
exchange interaction. Significant line narrowing was observed at low
temperatures, which we interpret as the suppression of localized spin
fluctuations.
