I need to create a graph of the following function:
S = r(1-cosA + Labda/2*sin2A)

I tried entering it in Excel and it gives a very nice error. The formula i filled in was:
(B1) =0,0425(1-(cosA1*(PI/180))+ 0,75*(sin2A1*(PI/180))

I get an empty cell saying #Name. how can i solve this ? I need to have this done beofre tomorrow 10 am. I would be more than just thankful for any help on this

S.