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.
The Crape Myrtle is a deciduous small tree or shrub that provides brilliant color all summer long. Plant one in your ornamental bed or anywhere youâd enjoy an enduring splash of color. The best feature of the Crape Myrtle is certainly the stunning scarlet performance it enacts each year.