Question

transformation formulae of trigonometry ...​

Answer 1

Answer:

2cosA cosB = cos(A + B) + cos(A - B) 2sinA sinB = cos(A - B) - cos(A + B) Now, the followingformulae transform the product of thetrigonometric ratios of the angles into the sum or the difference of the trigonometric ratios of the compound angles: 2 sinA cosB = sin(A + B) - sin(A - B)

Answer 2

Step-by-step explanation:

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