Product to Sum Flashcards by Terry Doo

Q

What is 2 cos(A) cos(B) equal to?

A

2 cos(A) cos(B) = cos(A − B) + cos(A + B)

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Q

What is 2 sin(A) sin(B) equal to?

A

2 sin(A) sin(B) = cos(A − B) − cos(A + B)

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Q

What is 2 sin(A) cos(B) equal to?

A

2 sin(A) cos(B) = sin(A + B) + sin(A − B)

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