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sin

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Returns the sine of $arg

namespace HH\Lib\Math;

function sin(
  num $arg,
): float;
  • To find the cosine, see Math\cos().
  • To find the tangent, see Math\tan().

Parameters​

  • num $arg

Returns​

  • float

Examples​

$rotation = 0;
$result = Math\sin($rotation);
echo "Math\sin of $rotation : $result \n";

$rotation = 90;
$result = Math\sin($rotation);
echo "Math\sin of $rotation : $result \n";

$rotation = 180;
$result = Math\sin($rotation);
echo "Math\sin of $rotation : $result \n";