Sum and Difference Identities Answers

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What is sin 20° cos 4° + cos 20° sin 4° equal to?

cos 16°

sin 16°

cos 24°

sin 24°

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Which expression is equal to sin 75°?

sin 135° cos 60° – cos 135° sin 60°

cos 135° cos 60° + sin 135° sin 60°

sin 135° cos 60° + cos 135° sin 60°

cos 135° cos 60° – cos 135° cos 60°

How would you apply the Cosine Angle Difference Identity to find the exact value of cos 75o?

cos (100.5o – 25.5o)

cos (120o – 45o)

cos (180o – 75o)

cos (30o + 45o)

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