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![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Apr 2008 06:34:15 IST
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sin x + sin 2 x= 1
sin x = cos 2 x
cos 12 x + 3 cos 10 x + 3 cos 8 x + cos 6 x
= sin 6 x + 3 sin 5 x + 3 sin 4 x + sin 3 x
= ( sin 2 x + sin x ) 3
= 1
So 1 - 1 = 0
Ans .
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