Pls answer the attachment for heavens sake...question number 11 option 2
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Cos (180°-55°)=-cos 125°
cos(180°+24°)=-cos 24°
cos (360°-60°)=cos 60°
cos 24°-cos 125°+cos 125°-cos 24°+cos 60°
cos 60°=1/2
cos(180°+24°)=-cos 24°
cos (360°-60°)=cos 60°
cos 24°-cos 125°+cos 125°-cos 24°+cos 60°
cos 60°=1/2
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