if A and B are measures of acute angles and tanA=1÷√3 and SinB=1÷2, then cos (A+B) is
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tanA=1÷√3
A=30
SinB=1÷2
B=30
A+B=60
cos (A+B)=cos 60=1/2
A=30
SinB=1÷2
B=30
A+B=60
cos (A+B)=cos 60=1/2
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