go/src/math/cmplx/sin.go

// Sin returns the sine of x.
func Sin(x complex128) complex128 { … }

// Sinh returns the hyperbolic sine of x.
func Sinh(x complex128) complex128 { … }

// Cos returns the cosine of x.
func Cos(x complex128) complex128 { … }

// Cosh returns the hyperbolic cosine of x.
func Cosh(x complex128) complex128 { … }

// calculate sinh and cosh.
func sinhcosh(x float64) (sh, ch float64) { … }