\frac{d}{{dx}}\arccos x = \frac{d}{{dx}}\cos ^{ - 1} x = \frac{{ - 1}}{{\sqrt {1 - x^2 } }}
% MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqr1ngB % PrgifHhDYfgasaacH8YjY-vipgYlh9vqqj-hEeeu0xXdbba9frFj0- % OqFfea0dXdd9vqai-hGuQ8kuc9pgc9q8qqaq-dir-f0-yqaiVgFr0x % fr-xfr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaae % aacaWGKbaabaGaamizaiaadIhaaaGaciyyaiaackhacaGGJbGaai4y % aiaac+gacaGGZbGaamiEaiabg2da9maalaaabaGaamizaaqaaiaads % gacaWG4baaaiGacogacaGGVbGaai4CamaaCaaaleqabaGaeyOeI0Ia % aGymaaaakiaadIhacqGH9aqpdaWcaaqaaiabgkHiTiaaigdaaeaada % GcaaqaaiaaigdacqGHsislcaWG4bWaaWbaaSqabeaacaaIYaaaaaqa % baaaaaaa!50F6!
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.
