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Addition Formulas: cos (A + B) = cos A cos B - sin A sin B
Chapter 1, Problem 35E(choose chapter or problem)
QUESTION: Problem 35E
Addition Formulas:
cos (A + B) = cos A cos B - sin A sin B
sin (A + B) = sin A cos B + cos A sin B
Use the addition formulas to derive the identities:
cos(A – B) = cos A cos B + sin A sin B
Questions & Answers
QUESTION: Problem 35E
Addition Formulas:
cos (A + B) = cos A cos B - sin A sin B
sin (A + B) = sin A cos B + cos A sin B
Use the addition formulas to derive the identities:
cos(A – B) = cos A cos B + sin A sin B
ANSWER:
Solution:
Step 1:
In this question we have to use the addition formula to derive the identity