.SS Functions
.
.TP
.B sin
Sine function.
.
.TP
.B cos
Cosine function.
.
.TP
.B tan
Tangent function.
.
.TP
.B asin
Inverse sine function.
.
.TP
.B acos
Inverse cosine function.
.
.TP
.B atan
Inverse tangent function.
.
.TP
.B deg
Convert radians to degrees.
.
.TP
.B rad
Convert degrees to radians.
.
.TP
.B fac
Factorial (!) function.
.
.TP
.B ch
Combination function. n choose k with integers n and k such that n >= k >= 0.