11 12 13 14 15 16 17 18 19 20 TIME REMAINING 01:19:02 Review the proof of tan (A- B) = - tanA - tanB 1 + (tanA)(tanB) To complete step 3, which expression must fill in each blank space? tan(A - B) = O cos(A) cos(B) Step 1: _ sin (A- B) O cos(A) sin(B) COS (A- B) O sin(A) cos(B) Step 2: =. sinAcosB - cosAsinB O sin(A)sin(B) COSAcosB + sinAsinB sinAcosB - cosAsinB Step 3: = cosAcosB + sinAsinB Step 4: tanA -tanB 1 + (tanA)(tanB)