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.
That really depends on the size and shape of the crape myrtle you choose. Look for plants with color and texture such as hosta, heuchera, azaleas, grasses, roses or hydrangea. Ultimately you should choose plants that you find interesting and that fit your sunlight and size requirements. Here are a few of my favorites: