Tan A =2 tan B=3, evaluate (cos A cos B - sinA sinB)
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Answer:
Tan(A+B) =(tanA+tanB) /1 - TanA tanB
=(2+3)/1-6
=-1
A+B=135°
Cos cosB - sinA sinB=cos(A+B) = cos 135°=-1/v2
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