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.
I'm right on the border of Zone 6, maybe a mile or two away. I purchased a Red Rocket Crepe Myrtle as they're rated down to Zone 6. The first two years it didn't bloom at all. This year it still wasn't blooming so I decided to try this instead of the big name brand fertilizer that rhymes with Miracle Toe. :p.