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January 25, 2015

January 25, 2015

Posted by **i need help** on Friday, January 11, 2013 at 7:21pm.

- math -
**bobpursley**, Friday, January 11, 2013 at 8:45pmcos(a+b)=sinasinb-cosa*cosb

sina is given, so cosa=4/5

sinb is given so cos b=12/13

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