float(sin(2^2048))?



What should maxima do with float(sin(2^2048))?  It currently generates
an error because 2^2048 is too big to fit in a double float.

We could do better than this by doing argument reduction of 2^2048.

Or the easy way is to tell the user to do float(bfloat(sin(2^2048))). 
Should maxima do that automatically?

Ray