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	sin(0.02) - 0.02	= -0.00000133330666692 …	[1]
How many terms of Maclaurin series do I need
to calculate sin(x)-x at x=0.02 with the same result?
First term:
	sin(0) - 0	= 0.0	[2]
Plus second term:
	ans + (cos(0) - 1) * 0.02	= 0.0	[3]
Plus third term:
	ans + ( - sin(0)) / 2 * 0.02**2	= 0.0	[4]
Plus fourth term:
	ans - cos(0) / fact(3) * 0.02**3	= -0.00000133333333333 …	[5]
Odd terms have sin(0) therefore they can be skipped.
Plus sixth term:
	ans + cos(0) / fact(5) * 0.02**5	= -0.00000133330666667 …	[6]
Plus eighth term:
	ans - cos(0) / fact(7) * 0.02**7	= -0.00000133330666692 …	[7]
Eight terms! So with eight terms, what is the error?
	[1] - [7]	= 1.41092961361E-21 …	[8]
Of course much of this error is the 10th term:
	cos(0) / fact(9) * 0.02**9	= 1.41093474427E-21 …	[9]

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