cos x cos[x]
Returns the cosine of
x, taken to be in radians. The result is between
1, or null if the argument is null or infinity.
q)cos 0.2 0.9800666 q)min cos 10000?3.14159265 -1f q)max cos 10000?3.14159265 1f
acos x acos[x]
Returns the arccosine of
x; that is, the value whose cosine is
x. The result is in radians and lies between 0 and π. (The range is approximate due to rounding errors).
Null is returned if the argument is not between -1 and 1.
q)acos -0.4 1.982313