Did you ever notice the default calculator app on the iPhone. Well for those of you who havent and rely on other available apps available through Appstore try the original calculator app. It includes all the features of a scientific calculator by just turing the iPhone to landscape.
The calculator includes functions like log, sin cos tan, root etc. Well its just amazing or I must say that this feature has been overlooked by me. Neways cheers to the newly discovered old calculator app 😉
(I noticed this on iPhone V2.0.2, need to see if the v1.x has it)