Trigonometric Functions
The functions (also called the circular functions) comprising trigonometry: the cosecant 
, cosine 
, cotangent 
, secant 
, sine 
, and tangent 
. However, other notations are sometimes used, as summarized in the following table.
 |
alternate notations |
 |
 (Erdélyi et al. 1981, p. 7),  (Gradshteyn and Ryzhik 2000, p. xxix) |
 |
 (Gradshteyn and Ryzhik 2000, p. xxvii) |
 |
 (Gradshteyn and Ryzhik 2000, p. xxix) |
The inverses of these functions (the inverse trigonometric functions) are denoted 
, 
, 
, 
, 
, and 
. Note that the 
notation here means inverse function, not 
to the 
power.
REFERENCES:
Erdélyi, A.; Magnus, W.; Oberhettinger, F.; and Tricomi, F. G. Higher Transcendental Functions, Vol. 1. New York: Krieger, p. 6, 1981.
Feynman, R. P. "A Different Set of Tools." In 'Surely You're Joking, Mr. Feynman!': Adventures of a Curious Character. New York: W. W. Norton, 1997.
Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 6th ed. San Diego, CA: Academic Press, 2000.
