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.
2. Loppers to cut branches 1/2-inch to 1-1/2 inches thick. 3. Pole pruners or a pruning saw to cut branches more than 1-1/2 inches thick. When to Cut. Late winter (right now) is the best time to prune a crepe myrtle, because itâs leafless and you can easily see all of the branches. It also blooms on new growth, so pruning now wonât reduce blooming. In fact, it may increase it.