Find value of cos 55 +cos 125+ cos 300
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cos (90°-55°)=sin 35°
cos (90°+35°)=- sin 35°
cos (360°-60°)=cos 60°
= sin35°-sin 35°+cos 60°
1/2
cos (90°+35°)=- sin 35°
cos (360°-60°)=cos 60°
= sin35°-sin 35°+cos 60°
1/2
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