Spreadsheet with a predefined sample: PI 8 decimal digit recursive calculation using Viete's formula in the form PI=((2-(2+(2+(2+(...)**0.5)**0.5)**0.5)**0.5)**0.5)*2**k where integer k is determinded using 2 and 4 as PI lower and upper bounds

	A	B	C	D	E	F	G	H	I
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