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Futurebasic/Language/Reference/atn
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Atn
Function
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Syntax
radianAngle# = atn( expr )
Description
Returns the arctangent of expr in radians. In other words, if expr represents the tangent of some angle, then atn(expr) returns the angle. The returned angle will be in the range of -π/2 to +π/2 radians (which corresponds to -90 to +90 degrees). atn always returns a double-precision result.
Example
Because atn(1) equals π/4, you can use atn to get a value for π.
dim pi#
end globals
pi = atn( 1 ) * 4
print pi
Program output:
3.14159265359
Notes
No special notes.
See Also
sin; cos; tan; asin; acos; atan
Language Reference