o.  (Verb)

PI TIMES (_)  o.y yields pi times y. For example, o. 1 is approximately 3.14159.

CIRCLE (0 0)  If k>:0, then k o.y yields one of the circular, hyperbolic, or pythagorean functions, according to the following table:

k	Function			     k	Function

0	%:1–y^2			      7	Tanh y
1	Sine y			       8	%:–>:y^2
2	Cosine y		      9	(y++y)%2
3	Tangent y		    10	|y
4	%:1+y^2	       11	(y–+y)%0j2
5	Sinh y		       12 (^.*y)%0j1
6	Cosh y

(-k)o.y is inverse to k o.y. The cases _1, _4, _9, and _10 are Arcsine y and %:<:y^2 and y and +y. The arguments of sin, cos, and tan (and the results of their inverses) are in radians.