Sum and Difference Identities For Sine - Pre-Calculus
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Use the sum or difference identity to find the exact value: 
Use the sum or difference identity to find the exact value:
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Again, here we break up the 165 into 
and solve using the sin identity: 
Again, here we break up the 165 into 
Is the following equation an identity? 
Is the following equation an identity?
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and so this is again not an identity
and so this is again not an identity
Is the following equation an identity? 
?
Is the following equation an identity? 
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Therefore, this is not an identity.
Therefore, this is not an identity.
Use the sum or difference identity to find the exact value:
Use the sum or difference identity to find the exact value:
Tap to see back →
Again, here we break up the 165 into and solve using the sin identity:
Again, here we break up the 165 into
Is the following equation an identity?
Is the following equation an identity?
Tap to see back →
and so this is again not an identity
and so this is again not an identity
Is the following equation an identity? ?
Is the following equation an identity?
Tap to see back →
Therefore, this is not an identity.
Therefore, this is not an identity.
Use the sum or difference identity to find the exact value:
Use the sum or difference identity to find the exact value:
Tap to see back →
Again, here we break up the 165 into and solve using the sin identity:
Again, here we break up the 165 into
Is the following equation an identity?
Is the following equation an identity?
Tap to see back →
and so this is again not an identity
and so this is again not an identity
Is the following equation an identity? ?
Is the following equation an identity?
Tap to see back →
Therefore, this is not an identity.
Therefore, this is not an identity.
Use the sum or difference identity to find the exact value:
Use the sum or difference identity to find the exact value:
Tap to see back →
Again, here we break up the 165 into and solve using the sin identity:
Again, here we break up the 165 into
Is the following equation an identity?
Is the following equation an identity?
Tap to see back →
and so this is again not an identity
and so this is again not an identity
Is the following equation an identity? ?
Is the following equation an identity?
Tap to see back →
Therefore, this is not an identity.
Therefore, this is not an identity.