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OpenStudy (user123):
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OpenStudy (user123):
jhonyy9 (jhonyy9):
cos(A-B)=cosAcosB +sinAsinB cos(A+B)=cosAcosB-sinAsinB sinAsinB =(1/2)[cos(A-B)-cos(A+B)] =(1/2)(cosAcosB +sinAsinB)-(cosAcosB-sinAsinB) =(1/2)(sinAsinB+sinAsinB) =('/2)(2sinAsinB) =sinAsinB hope helped
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