Pre-Cal 40S Slides March 24, 2008Presentation Transcript

Sum and Difference Proofs
(continued ...)
cosbmw by marymactavish

Proofs of the Sum and Difference Identities ...
Rotate ∠ROP so that OP
O lies on the positive x-axis O

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)

Proofs of the Sum and Difference Identities ...
Rotate ∠ROP so that OP
O lies on the positive x-axis O

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