13. If sin (A – B) =
1
2 and cos (A + B) =
1
2 , then find A and B
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0
Step-by-step explanation:
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Answer:
final answer A=60=====B=30
Step-by-step explanation:
sin(A+B)=1
cos(A-B)=✓3/2
we know sin¹-=90
A+B=9-----[1]
cos (A-B)=root 3/2
A-B=cos-¹root3/2
we know cos-¹root3/2=30
A-B=30-----[2]
solve [1] and [2]
A+B=90
A-B=30add
2A=120
A=60 B=30
final answer A=60 B=30
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