Review the proof of Tangent (A minus B) = StartFraction tangent A minus tangent B Over 1 + (tangent A) (tangent B) EndFraction. tan(A – B) =

Step 1: Equals StartFraction sine (A minus B) Over cosine (A minus B) EndFraction

Step 2: Equals StartFRaction sine A cosine B minus cosine A sine B Over cosine A cosine B + sine A sine B EndFraction

Step 3: Equals StartStartFraction StartFraction sine A cosine B minus cosine A sine B Over blank EndFraction OverOver StartFraction cosine A cosine B + sine A sine B Over blank EndFraction EndEndFraction

Step 4: Equals StartFraction tangent A minus tangent B Over 1 + (tangent A) (tangent B)

To complete step 3, which expression must fill in each blank space?