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HIMANSHU JAIN (376)

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tan/2.
labl = (a2+b2  2lallblcos)
a2 = b2 =1=lal=lbl
:. we get
 
(2 -2cos)/(2+2cos)
= ( tan2/2)

Himanshu Jain P.E.C. http://jainhim.blogspot.com/
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