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.
Crepe Myrtleâs require full sun. Plant where they get at least 6-8 hours of direct sunlight. This will allow for the most bloom production through out the summer months. Too much shade will reduce growth and increase problems such as sooty mold and powdery mildew on flower buds and new growth.