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use a sum or difference identity to find an exact value

pie/12
14 years ago

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Answered by alex
cos pie/12
14 years ago
Answered by bobpursley
Hmmm. 15 degrees. I know 45, and 30, so why not the difference?

Cos15=cos(45-30) = you know the formula
14 years ago
Answered by amber
i got it nevermind
14 years ago
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