[mbreese]

Or they could go really old-school and provide a look up table...

sin(x) = y

for a variety of values of x.

Or, even nicer -- instead of having a correct numerical answer, they could write the answers as formulas. Then you wouldn't need to know the actual values at all. (Then again, this could also be a pain).

But some combination of the two should be possible without needing manual computation.