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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.
Reference
Sin ▪ Cos ▪ Tan ▪ Csc ▪ Sec ▪ Cot
ArcSin ▪ ArcCos ▪ ArcTan ▪ ArcCsc ▪ ArcSec ▪ ArcCot
Degree (°) — constant to convert from radians to degrees
I (
) — 
, entered as EsciiEsc ("imaginary i")
FromDMS, DMSList — convert between radians and degrees, minutes, seconds
FullSimplify — simplify trigonometric expressions
FunctionExpand — reduce to algebraic forms or simpler arguments
TrigExpand — 
etc.
TrigFactor — Sin[..]+Sin[..]
product of terms, etc.
TrigReduce — 
etc.
TrigToExp, ExpToTrig — convert between trigonometric functions and exponentials
ComplexExpand — expand into real and imaginary parts
