help me!!!

dis semester i take mathematics 5.. to be specific "complex analysis and partial differential equations".. it's damn hard.. i dun understand why i should learn all this stuff... nowadays computer can calculate everything for us.. just key-in the data and the answer will be pop out.. why we should learn to calculate manually?? what is more worst is our assignment!!!!! we have to do the coding so that the computer can calculate the mathematics problems... the problem is we learn mathematics not programming!!!!!!!! tidaaaaaaaaaaakkkkkkkkkk!!!!!!!!!!!!