Trigonometric Difference Identities Answers
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Review the steps of the proof of the identity .Step 1: = Step 2: = Step 3: = Step 4: = Step 5:
A
step 1B
step 2C
step 3D
step 42
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Review the proof of sin(A – B) = sinAcosB – cosAsinBsin(A – B) = Step 1: Step 2: Step 3: Step 4: = sinAcosB – cosAsinB
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.3
Which expression is equivalent to sin(20°)cos(80°) – cos(20°)sin(80°)?
A
sin(–60°)B
cos(–60°)C
cos(60°)D
sin(60°)4
What is the exact value of ?
A
StartFraction StartRoot 6 EndRoot minus StartRoot 2 EndRoot Over 8 EndFraction
B
StartFraction StartRoot 6 EndRoot minus StartRoot 2 EndRoot Over 4 EndFraction
C
StartFraction StartRoot 6 EndRoot + StartRoot 2 EndRoot Over 8 EndFraction
D
StartFraction StartRoot 6 EndRoot + StartRoot 2 EndRoot Over 4 EndFraction
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