If $sin(A+B) = cos(A-B)=\frac{\sqrt{3}}{2}$ and A and B are acute angles. The measures of angles A and B (in degrees) will be:
Answer & explanation
Correct answer: option 1
Given :-
$sin(A+B) = cos(A-B)=\frac{\sqrt{3}}{2}$
sin(A+B) = \(\frac{√3 }{2}\)
we know , sin 60º = \(\frac{√3 }{2}\)
So, ( A + B ) = 60º ------(1)
cos(A-B) = \(\frac{√3 }{2}\)
we know , cos 30º = \(\frac{√3 }{2}\)
So, ( A - B ) = 30º ------(2)
Adding equation 1 and 2
2A = 90º
A = 45º
By putting value of A in equation 1
45º + B = 60º
B = 15º
ANs :- A = 45º and B = 15º