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.
Information on Crepe Myrtle Trees. Crepe Myrtles are planted for their colors. With blossoms in purple, red, white, lavender, and bright pink, Crepe Myrtles are valued for the unique vibrant focal point they offer gardens. These ornamental trees are often planted as accent plants, drawing attention toward the tree.