ReferenceExpressionsTrigonometryTangentReturn the tangent of a.tan( a )# Return the tangent of a. Description# tan( a ) Return the tangent of a in radians. Parameters# a Value Return value# Tangent of a in radians Example usage# tan( PI/4 ) Returns 1. Last updated Sep 2, 2019PreviousSineNextCelsius to Kelvin