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OpenStudy (anonymous):
cos 165 degrees use identities to find the exact value.
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OpenStudy (solomonzelman):
cos(165)=cos(180-15) RULE: cos(A-B)=cosAcosB+sInAsinB
OpenStudy (anonymous):
so, after putting it into the calculator, it got-.965? would this be the answer?
OpenStudy (anonymous):
and thank you very much by the way!
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