Cubeman's Notes on PI
pi/4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 ...
This is the Taylor Series for arctan at 1
pi/2 = 1 + 1/3 + 1/3*2/5 + 1/3*2/5*3/7 + 1/3*2/5*3/7*4/9 + ...
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