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January 30, 2015

January 30, 2015

Posted by **Blaire** on Sunday, March 2, 2014 at 5:54pm.

- Trig -
**Damon**, Sunday, March 2, 2014 at 7:12pmcos (x-y) = cos x cos y = sin x sin y

cos x = -sqrt7 /4

cos y = -5/13

sin x = 3/4

sin y = 12/13

so

cos(x-y)=5sqrt7/52 - 9/13

- Trig -
**Damon**, Sunday, March 2, 2014 at 7:38pmsorry typo

cos x cos y + sin x sin y

5 sqrt 7/52 + 9/13

= .9467

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