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.
Crepe myrtles they said would grow 10 to 15 feet tall ended up growing 20 to 30 feet tall. Which meant that many crepe myrtles grew too big for the spots they were in and homeowners started chopping off their heads every spring. (To see how to correctly prune a large crepe myrtle, click right here .).