SOLUTION: If A and B are two angles in Quadrant 2 such that tan A=-1/2 and tan B=-2/3, find cos(A+B). Thank you so much for all of your help!!!! God Bless!!!!!

Question 391236: If A and B are two angles in Quadrant 2 such that tan A=-1/2 and tan B=-2/3, find cos(A+B).
Thank you so much for all of your help!!!!
God Bless!!!!!
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
tan A = -1/2 ==> ==> ==> .
tan B = -2/3 ==> ==> ==> .
Now
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