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.
Care guide for the Crepe Myrtle Bonsai tree The Crepe Myrtle is a subtropical deciduous tree with beautiful pink, white or purple flowers and smooth beige dappled peeling bark. The Crepe Myrtle is native to subtropical regions of Asia and Australia and grows as a deciduous tree or shrub. It produces beautiful pink, white or purple flowers with crinkled petals. The trunk has a smooth beige dappled bark which peels each year when the trunk gets thicker.