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Tanh is the hyperbolic tangent function, which is the hyperbolic analogue of the Tan circular function used throughout trigonometry. Tanh [Î±] is defined as the ratio of the corresponding hyperbolic sine and hyperbolic cosine functions via . Tanh may also be defined as , where is the base of the natural logarithm Log. Tanh automatically evaluates to exact values when its argument is the (natural) logarithm of a rational number.
Learning Objectives. 1  Describe how different types of epithelia (simple, stratified, squamous, columnar) facilitate the performance of different functions. 2  List the junctional complexes that hold epithelial cells together and their primary functions. 3  List the functions of the basement membrane and how epithelial cells attach to the basement 4  ... Diagiven the wide distribution, epithelial cells perform a variety of functions: protection (skin), absorption (intestine), secretion (glands), excretion (kidney), gas exchange (lung and blood vessels). To perform these functions, epithelia assemble into different structures.