cos(A+B)=cos(A-(-B))=cosAcosB(-B)+sinAsin(-B) therefore cos(A+B)=coaAcosB-sinAsinB
mathewcos(A+B)=cos(A-(-B))=cosAcosB(-B)+sinAsin(-B) therefore cos(A+B)=coaAcosB-sinAsinB
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