CBSE Class 11-science Answered
Trigonometry
Asked by gouthamjayarajan | 27 Oct, 2009, 10:19: PM
Expert Answer
cos(A+B) = cosAcosB - sinAsinB
and cos(A-B) = cosAcosB + sinAsinB
cos(A+B) - cos(A-B) = (cosAcosB - sinAsinB) - (cosAcosB + sinAsinB) = -2sinAsinB
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TopperLearning.
Answered by | 27 Oct, 2009, 11:10: PM
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