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[Post New]19 Feb 2008 19:27:18 IST
    Subject: given
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shailesh_45 (63)

Blazing goIITian

Olaaa!! Perrrfect answer. 11  [15 rates]
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cos  = cos .cos = cos.cos
 
sin  =( 2sin/2 )(sin@/2)   .......@= theta
 
to prove
tan /2 =( tan/2)(tan/2)
    
 

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