Chapter 5
Chapter 5
Chapter 5
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Cofunction identities<br />
Theorem (The Cofunction Identities)<br />
cos( π<br />
− t) = sin t, sin(π − t) = cos t<br />
2 2<br />
Example) Using the cofunction identities, verify that<br />
cos( π π<br />
6 ) = sin( 3 ).<br />
Proof(s) of theorem.
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