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tan /2.la bl = (a2+b2 2lallblcos )a2 = b2 =1=lal=lbl :. we get (2 -2cos )/(2+2cos )=
( tan2 /2) |
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Himanshu Jain P.E.C. http://jainhim.blogspot.com/ |
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tan
/2.
(a2+b2
( tan2







