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.
â¢ They bloom in mid-late summer and the flowers can last as long as 100 days. â¢ There is a crape myrtle for every garden! They come in a range of sizes. â¢ The interesting bark color and patterns of crape myrtle is a real landscape asset.