Math, asked by aasthamendhe8, 3 months ago

prove that cos(A+B).cos(A-B)= cos²A- sin²B

Answers

Answered by harshagayle175

0

Answer:

Step-by-step explanation:

cos(a+b)=cosA-sinB

cos(A-B)=CosA+sinB

(cosA-sinB)cosA+sinB)=cos^2A-sin^2B

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