calculate the value of pi from the infinite series
pi= 4(1-1/3+1/5-1/7+1/9-1/11.....)
print a table that shows the value of pi approximated by computing one term
of this series, by two terms, three terms, and so on.
how many terms of this series do you have to use before you first get
3.14?3.141?3.1415?3.14159?
pi = 3.14159265
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