Guest: tan^-1(5/7)
Inverse tan is the same as arctan
tan
-1(5/7) can be written atan(5/7)
You use inverse tan when it is the angle that you are finding. You would use tan if you had the angle and needed to find a side.
atan(5/7)
If you were doing this on most hand held calculators you could press the 'degrees minutes seconds' button to convert it to that form.
+118608 
