4 Functions Math Trig Geometry

This project is to make 4 functions, preferably in VB.net but I can accept C or other language if the code is easily understood and converted. I attached 4 images showing the trig problems drawn in CAD so that you can see the inputs and the correct result for one set of inputs. Of course the functions must work taking all of the variables as input and return the one shown with the ? sign. Two of the examples have a variable named LOF, that input to accept positive or negative values (a negative value would be in the opposite direction)