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Use vector method to prove the subtraction formula for cosine function i. e,prove that cos(A-B)=cosA. cosB+sinA. sinB

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Use vector method to prove the subtraction formula for cosine function i. e,prove that cos(A-B)=cosA...

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Use vector method to prove the subtraction formula for cosine function i. e,prove that cos(A-B)=cosA. cosB+sinA. sinB​

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Another question on Mathematics

Use vector method to prove the subtraction formula for cosine function i. e,prove that cos(A-B)=cosA. cosB+sinA. sinB