ReactOS Calc allows the calculation of three types of trigonometric functions with their inverse operations.
These functions can be used with three different angular units of measurement: degrees, radians or gradians.
The angular mode does not affect the non trigonometric functions.
Please note that the degree type uses decimal degrees and not angles in the degree-minute-second form.
The available functions are:
It calculates the sine of the given angle.
If the 
modifier is activated, it finds the angle whose sine value is shown into the output display.
It calculates the cosine of the given angle.
If the
modifier is activated, it finds the angle whose cosine value is shown into the output display.
It calculates the tangent of the given angle.
If the
modifier is activated, it finds the angle whose tangent value is shown into the output display.