cosx, sinx and e^x go to a party. sinx and cosx are partying away but e^x is miserable and anti social. cosx and sinx go up to e^x and say ‘what’s wrong, why don’t you integrate?’

e^x replied, It doesn’t make any difference does it?

This little joke should remind students about integrating the three terms. And a side note, they are really related, for instance in Complex Numbers.

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