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September 21, 2014

September 21, 2014

Posted by **Tommyt** on Saturday, February 9, 2013 at 4:18am.

- Math -
**Steve**, Saturday, February 9, 2013 at 2:58pmrecall the half-angle formula

tan x/2 = (1-cosx)/sinx

tan(45/2) = (1-1/√2)/(1/√2) = √2 - 1

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