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.
Plant It as a Tree or a Shrub Plant a Hopi Crape Myrtle anywhere you want billowy pink splashes of color. This Myrtle is more compact than most varieties, so you wonât have to worry about it taking over your landscape. It has a round, balanced shape with the height being proportionate to its width (approximately 10 feet by 10 feet).