ScientificCalculator.CheckTrigonometricKey(string)

Namespace: CalculatorClassLibrary

Description: Attaches angular unit notation to trigonometric operator.

Parameters	Description
input<string>	trigonometric operator

Returns	Description
string	trigonometric operator with angular unit notation attached

Remarks:

Angular unit notations are text notations indicating angular unit used for a particular trigonometric function, for example, these notations can be: "₀", "ᵣ" and "₉"; thus trigonometric function Sin₀(8) means sine function using degrees as measuring unit, whereas Sinᵣ(8) indicates radians is being used as measuring unit.