>>  <<  Usr  Pri  JfC  LJ  Phr  Dic  Rel  Voc  !:  Help  Dictionary

 Pi Times o.  0 0 0 Circle Function

 o. y yields π times y . Thus o. 1 is approximately 3.14159 . The function x&o. is even or odd as x is even or odd; (-x)&o. is its inverse (that is, y = (-x) o. x o. y for y in a significant sub-domain).

 x o. y x (-x) o. y Sqrt 1-(Sqr y) 0 Sqrt 1-(Sqr y) 0&o.@(1&o.) ↔ 2&o. Sine y 1 Arcsine y Radian arg/result Cosine y 2 Arccos y " Tangent y 3 Arctan y " Sqrt (Sqr y)+1 4 Sqrt (Sqr y)-1 4&o.@(5&o.) ↔ 6&o. Sinh y 5 Arcsinh y Sinh is hyperbolic sine Cosh y 6 Arccosh y Tanh y 7 Arctanh y Sqrt - (1 + Sqr y) 8 - Sqrt - (1 + Sqr y) RealPart y 9 y Magnitude y 10 Conjugate (+y) ImaginaryPart y 11 j. y AngleOf y 12 ^j. y

Examples:
```   rfd=: 180 %~ o.    NB. Radians from degrees
sin=: 1&o.
SIN=: sin@rfd
(rfd 0 90 180);(sin 0 1.5708);(SIN 0 90)
+----------------+---+---+
|0 1.5708 3.14159|0 1|0 1|
+----------------+---+---+
```

>>  <<  Usr  Pri  JfC  LJ  Phr  Dic  Rel  Voc  !:  Help  Dictionary