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sin (A-B ) =1/2
sin (A-B ) =sin30
A-B =30
similarly
cos (A+B)= 1/2
cos (A+B)= cos 60
A+B =60
from elimination method
A - B=30
A+B =60
--------------
2A=90
A= 45
putting above value in A-B=30
A-B=30
45-B=30
B= 15
i hope its help
sin (A-B ) =1/2
sin (A-B ) =sin30
A-B =30
similarly
cos (A+B)= 1/2
cos (A+B)= cos 60
A+B =60
from elimination method
A - B=30
A+B =60
--------------
2A=90
A= 45
putting above value in A-B=30
A-B=30
45-B=30
B= 15
i hope its help
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