  We utilize precise weak interaction experiments on atomic muon capture and
beta decay in the A = 3 nuclei, and take into account the effects of nuclear
"anomalous thresholds" to extract the pseudoscalar pi-^3He-^3H coupling
parameter, G^{eff}(m_\pi^2) = 45.8+- 2.4. This is an order of magnitude
improvement in precision over that from the use of pion-nuclear scattering data
and dispersion relations.
