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Dear all,

could you please let me know how to write a code? I just get started with the SAGE and met a trouble. When I put the followings

f=e^x f

then the output is a polynomial function with 16th order. But I wanted to drop the higher order terms and just take 3 tems. However I have no idea how to do it. It seems the truncate() or power_series(ZZ) don't work for the exponential function. Could anyone give me the solution?

thank you.

Dear all,

could you please let me know how to write a code? I just get started with the SAGE and met a trouble. When I put the followings

f=e^x f=e^x; f

then the output is a polynomial function with 16th order. But I wanted to drop the higher order terms and just take 3 tems. However I have no idea how to do it. It seems the truncate() or power_series(ZZ) don't work for the exponential function. Could anyone give me the solution?

thank you.