<cat>libraryfunc</cat> # Not a function This is NOT a function, it's a variable containing the mathematical constant pi. (`3.1415926535898`) See also: <page>Trigonometry</page> <example> <code> print( math.sin( math.pi ) ) print( math.cos( math.pi ) ) </code>⤶ <output>⤶ -1⤶ </output>⤶ </example>⤶ ⤶ # Floating point precision considerations⤶ ⤶ It should be noted that due to the nature of floating point numbers, results of calculations with `math.pi` may not be what you expect.⤶ ⤶ <example>⤶ <description>⤶ sin(π) = 0, but because floating point precision is not unlimited it cannot be calculated as exactly 0.⤶ </description>⤶ <code>⤶ print( math.sin( math.pi ), math.sin( math.pi ) == 0 )⤶ </code> <output> 1.2246467991474e-16⤶ 1.2246467991474e-16 false⤶ </output> </example>