3
QuizMultiple Choice
Trigonometric Difference Identities
Question 3 • Precalculus
Review the proof of sin(A – B) = sinAcosB – cosAsinBsin(A – B) = Step 1: Step 2: Step 3: Step 4: = sinAcosB – cosAsinB
Answer
A
Step 3 should be step 1.B
Step 4 should be step 1.C
Steps 1 and 2 must be switched.D
Steps 1 and 3 must be switched.