Precalculus : Sum and Difference Identities For Sine

Study concepts, example questions & explanations for Precalculus

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Example Questions

Example Question #1 : Sum And Difference Identities

Use the sum or difference identity to find the exact value: 

Possible Answers:

Correct answer:

Explanation:

Again, here we break up the 165 into  and solve using the sin identity:   

Example Question #1 : Sum And Difference Identities For Sine

Is the following equation an identity? 

Possible Answers:

It cannot be determined from the given information.

No it is not an identity.

Yes it is an identity.

Correct answer:

No it is not an identity.

Explanation:

and so this is again not an identity

Example Question #2 : Sum And Difference Identities

Is the following equation an identity? ?

Possible Answers:

Yes it is an identity

The question cannot be answered based on the information provided.

No it is not an identity

Correct answer:

No it is not an identity

Explanation:

Therefore, this is not an identity.

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