Compute by Machins approximation 16 arctan (1/5) - 4 arctan (1/239) to 10S (which are correct).

Compute π by Machin’s approximation 16 arctan (1/5) - 4 arctan (1/239) to 10S (which are correct). [In
1986, D. H. Bailey (NASA Ames Research Center, Moffett Field, CA 94035) computed almost 30 million decimals of π on a CRAY-2 in less than 30 hrs. The race for more and more decimals is continuing.