Product-to-Sum Identities Flashcards by Diego Gryth

Q

What is sin(a) sin(b)?

A

(1/2)[cos(a - b) - cos(a + b)]

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Q

What is cos(a) cos(b)?

A

(1/2)[cos(a - b) + cos(a + b)]

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Q

What is sin(a) cos(b)?

A

(1/2)[sin(a + b) + sin(a - b)]

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