cos24+cos55+cos155+cos204+cos300
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L.H.S. = cos24+cos204+ cos55 + cos125 +cos300. = cos 24 + cos (180 +24) + sin (90-55) + cos (90+35) + cos (360- 60) [ cos x = sin (90-x)]. = cos 24 - cos 24 ...
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this is ur required result
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u got it
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