Question: 2 sin a cos b is equal to?
Answer: 2 cosA cosB = cos(A + B) + cos(A - B) 2 sinnA sinB = cos (A - B) - cos(A + B) 2sinA cosB = sin(A + B) + sin(A - B) 2 cosA sinB = sin(A + B) - sin(A - B)