the author of this app says:
TotalCalc is a straightforward fully functional scientific calculator for your Pocket PC. All major advanced functions, type in math expressions just as you would write them. Quick and easy to use. Work out angles in both Degrees and Radians. Have the full answer displayed or rounded to a number of decimal places, edit input box directly using keyboard/pad or letter recogniser built in to your Pocket PC, or just use the buttons on the screen.