This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
 Trigonometric Functions With careful attention to branch cuts, Mathematica supports trigonometric functions everywhere in the complex plane, with extensive exact and algebraic transformations, together with efficient arbitrary-precision numerical evaluation. Mathematica follows the standard mathematical convention of using radians for trigonometric function arguments. Sin  ▪ Cos  ▪ Tan  ▪ Csc  ▪ Sec  ▪ Cot      Degree (°) — constant to convert from radians to degrees I () — , entered as Esc ii Esc ("imaginary i")      FullSimplify — simplify trigonometric expressions FunctionExpand — reduce to algebraic forms or simpler arguments      TrigExpand — Sin[2x]2 Sin[x]Cos[x] etc. TrigFactor — Sin[..]+Sin[..]→product of terms, etc. TrigReduce — 2 Sin[x]Cos[x]Sin[2x] etc. TrigToExp, ExpToTrig — convert between trigonometric functions and exponentials ComplexExpand — expand into real and imaginary parts TUTORIALS Elementary Transcendental Functions Trigonometric Expressions Some Mathematical Functions MORE ABOUT Hyperbolic Functions Sound and Sonification Elementary Mathematical Functions RELATED LINKS Demonstrations related to Trigonometric Functions (The Wolfram Demonstrations Project)