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.
A U.S. Department of Agriculture research scientist bred these beauties, and now they are grown by J. Berry Nursery in Texas. Five in series. The stunning black diamond crape myrtle has five different colors. We all know how different reds can be, and there is the Best Red, which is a very dark red. You might think it wouldn't show up with the dark burgundy leaves, but it is a beautiful mix of colors.
How Fast Will Crape Myrtles Grow? Crape myrtle, often called the lilac of the South, is a shrub or tree suitable for many landscape settings. Crape myrtle produces clusters of red, white, pink or purple flowers in summer, followed by brown fruit pods that remain on the plant through the winter.