Is there more or less simple way to generate magic and semi magic squares in maple by just giving the order and the magic constant?

If I input 3^665 the whole number is displayed. How to display only last few digits?

When I make the input 2*pi*440 the output is pi880.

How to come to the result 2764,6 radians?

cos(440*2*pi*t)+cos(554*2*pi*t)+cos(659*2*pi*t)

How to turn the above row into complex exponential Fourier series?

For example how to input the mixed fraction 3 1/7? What are keys for super- and subscript?