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.
How to Plant Crepe Myrtle Trees. Planting a new tree requires forethought and care. The first step is to determine which species, if any, of Crepe Myrtle works best for the property in question. Once a species has been determined, buy the Crepe Myrtle from a reputable arborist, such as The Tree Center.