description

# tan function Null safety

double tan (

1. num radians

)

Converts `radians` to a double and returns the tangent of the value.

The tangent function is equivalent to `sin(radians)/cos(radians)` and may be infinite (positive or negative) when `cos(radians)` is equal to zero. If `radians` is not a finite number, the result is NaN.

## Implementation

    external double tan(num radians);