Essential things to remember from today's class (class 8, 14th September)

Be sure that you could re-create the sine computing function, using other
   more simple functions to do the real work. If you haven't learned about
   Taylor series yet, then of course you can't be expected to come up with
   the formula yourself, but given the formula you should be able to do it.

   For example, the series for cosine is
      1 - (x to the power of 2) / (2 factorial)
        + (x to the power of 4) / (4 factorial)
        - (x to the power of 6) / (6 factorial)
        + (x to the power of 8) / (8 factorial)  and so on
   You should be able to implement that.