\cos x = \sum\limits_{n = 0}^\infty {\frac{{\left( { - 1} \right)^n x^{2n} }}{{\left( {2n} \right)!}}}
% MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqr1ngB % PrgifHhDYfgasaacH8YjY-vipgYlh9vqqj-hEeeu0xXdbba9frFj0- % OqFfea0dXdd9vqai-hGuQ8kuc9pgc9q8qqaq-dir-f0-yqaiVgFr0x % fr-xfr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaci4yai % aac+gacaGGZbGaamiEaiabg2da9maaqahabaWaaSaaaeaadaqadaqa % aiabgkHiTiaaigdaaiaawIcacaGLPaaadaahaaWcbeqaaiaad6gaaa % GccaWG4bWaaWbaaSqabeaacaaIYaGaamOBaaaaaOqaamaabmaabaGa % aGOmaiaad6gaaiaawIcacaGLPaaacaGGHaaaaaWcbaGaamOBaiabg2 % da9iaaicdaaeaacqGHEisPa0GaeyyeIuoaaaa!4DFC!
Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.
