Find all solutions of the equation in the interval 0 2 sinx3
Find all solutions of the equation in the interval [0, 2).
sin(x+/3)+sin(x-/3)=1
Solution
sin ( x + pi/3) + sin ( x - pi / 3) = 1
(sin x * cos pi/3 + cos x * sin pi/3) + (sin x * cos pi/3 - cos x * sin pi/3) = 1
2*sin x * cos pi/3 = 1
2*sin x * 1/2 = 1 [ cos pi/3 = 1/2]
sin x = 1
sin x = sin pi/2 ------------------------------1
x = pi/2
since sin x is +Ve in 2nd quadrant ,so eq 1 may be written as:
sin x = sin ( pi - p1/2) [ sin ( pi - @) = sin @]
sin x = sin pi/2
x = pi/ 2 ----------ans

