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Bacosasinacbacgivesc2=�b�acos2 �asin2=b2�2abcos A2cos2 A2sin2=b2�2abcos A2 Additionandsubtractionformulaesin(x Y)=sinxcosy Cosxsinysin(x�y)=sinxcosy�cosxsinycos(x Y)=cosxcosy�sinxsinycos(x published presentations and documents on DocSlides.
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