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+.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.