Asked by alex
use a sum or difference identity to find an exact value
pie/12
pie/12
Answers
Answered by
alex
cos pie/12
Answered by
bobpursley
Hmmm. 15 degrees. I know 45, and 30, so why not the difference?
Cos15=cos(45-30) = you know the formula
Cos15=cos(45-30) = you know the formula
Answered by
amber
i got it nevermind
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