Defining the cotangent function. The cotangent function is an old mathematical function. It was mentioned in 1620 by E. Gunter who invented the notation of cotangens. Later on J. Keill (1726) and L. Euler (1748) used this function and its notation in their investigations.
Crepe Myrtles are among the toughest, most adaptable, and showiest plants that can be grown in the Texas landscape. Along with their bright colorful bloom display during the summer months the leaves of the Crepe Myrtle also turn orange, red and yellow in the fall.
Site Selection: Crape myrtles must be in full sun (at least 6 hours daily) to bloom to their maximum potential. Allow ample space for the mature height and spread of the selected crape myrtle variety: a few feet for miniatures and as much as 25 feet for the larger varieties such as Natchez or Muskogee.ite Selection: Crape myrtles must be in full sun (at least 6 hours daily) to bloom to their maximum potential. Allow ample space for the mature height and spread of the selected crape myrtle variety: a few feet for miniatures and as much as 25 feet for the larger varieties such as Natchez or Muskogee.