Answers PrecalculusTrigonometric Difference Identities

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:

step 1

step 2

step 3

step 4

Review the proof of sin(A – B) = sinAcosB – cosAsinBsin(A – B) = Step 1: Step 2: Step 3: Step 4: = sinAcosB – cosAsinB

Step 3 should be step 1.

Step 4 should be step 1.

Steps 1 and 2 must be switched.

Steps 1 and 3 must be switched.

Which expression is equivalent to sin(20°)cos(80°) – cos(20°)sin(80°)?

sin(–60°)

cos(–60°)

cos(60°)

sin(60°)

What is the exact value of ?

StartFraction StartRoot 6 EndRoot minus StartRoot 2 EndRoot Over 8 EndFraction

StartFraction StartRoot 6 EndRoot minus StartRoot 2 EndRoot Over 4 EndFraction

StartFraction StartRoot 6 EndRoot + StartRoot 2 EndRoot Over 8 EndFraction

StartFraction StartRoot 6 EndRoot + StartRoot 2 EndRoot Over 4 EndFraction

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