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Rajan@2021
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If A = 60° and B = 30° verify that cos(A-B) = cosA cosB – sinA sinB

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This is the basic and exam oriented question from trigonometric ratios in which we have given A = 60° and B = 30°

We need to prove that cos(A-B) = cosA cosB – sinA sinB

RS Aggarwal, Class 10, chapter 11, question no 15(ii).

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