For example, sin(θ) + 1 sin(θ) -cos 2 (θ) sin(θ) can be simplified in (2 sin(θ)). However, we prefer to present the unsimplified expressions, which are used in our quantum dynamics code and come directly from the TANA code . The present triatomic KEO has been published in the past by several group . Isotope masses (g.mol -1 ) masses (au) 35