cosines

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Posted by tracey on November 13, 2002 at 14:58:16:

I have a question on cosines from your algebra 2 tutorial. In example 1. Find cosine of 15 degrees. It says to write 15 degrees in terms of angles with known trig values 45 and 30 degrees. I am missing the jump from 15 degrees to 45-30. Can you explain why those numbers were picked and what the rational behind that.

Thanks so much!!!

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