1
If sin (A-B)=1÷2
and cos (A + B) = 1÷2, then find A and B
Answers
Answer:
Given data,
sin(A - B ) = 1/2 cos (A - B) = 1/2
but we know that But we know that
sin30 = 1/2 cos 60 = 1/2
thus, thus,
sin ( A - B ) = sin 30 cos (A - B) = cos 60
A - B = 30 ….(1) A + B = 60 … (2)
our equation are
A-B = 30 …1
A+B = 60...2
Adding (1) and (2)
A-B + A+B = 60 + 30
2A = 90
A = 90/2
A = 45
Putting A = 45 in (2)
A+B = 60
45 + B = 60
B = 60 - 45
B= 15
Hence, A = 45 , B = 15
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