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.
Crape Myrtle Blooms Color Changes. I have four different Crape Myrtles on my property that my father planted about two years ago when he lived here: two Miamis, one Muskogee, and one Pink Velour. Originally, the Pink Velour would bloom hot, hot pink, however they have since turned white, and the Muskogee has faded from a rich lavender to a pale.