cos 47 cos13 - sin 47 sin13
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cos47°cos13°-sin47°sin13°
=cos(47°+13°) [∵, cos(A+B)=cosAcosB-sinAsinB]
=cos60°
=1/2
=cos(47°+13°) [∵, cos(A+B)=cosAcosB-sinAsinB]
=cos60°
=1/2
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