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# Pre-Cal 40S March 26, 2009

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Proofs of the sum and difference identities.

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### Pre-Cal 40S March 26, 2009

1. 1. Sum and Difference Proofs (continued ...) cosbmw by marymactavish
2. 2. A Quiz PICT0015 by matt-hieu ergosteur
3. 3. Proofs of the Sum and Difference Identities ... Rotate ROP so that O O OP lies on the positive x-axis TO BE COMPLETED
4. 4. Proofs of the Sum and Difference Identities ... Rotate ROP so O O that OP lies on the positive x-axis
5. 5. Recall the Even and Odd Identities The sine and tangent functions are ODD functions. Cosine is an EVEN function. sin(-x) = -sin(x) cos(-x) = cos(x) tan(-x) = -tan(x)
6. 6. Proofs of the Sum and Difference Identities ... Rotate ∠ROP so that OP O O lies on the positive x-axis
7. 7. Recall the Even and Odd Identities The sine and tangent functions are ODD functions. Cosine is an EVEN function. sin(-x) = -sin(x) cos(-x) = cos(x) tan(-x) = -tan(x)