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sin(a - b) = (1/2)sqrt(3) ?
sin(a - b) = sina.cosb - sinb.cosa
(1/2)sqrt(3) = 1/2 - sinb.cosa
sinb.cosa = 1/2 - (1/2)sqrt(3)
sinb.cosa = (1 - sqrt(3))/2
(sin(a + b))/(sin(a - b)) = (sina.cosb + sinb.cosa)/((1/2)sqrt(3))
= (1/2 + ((1 - sqrt(3))/2)/((1/2)sqrt(3))
= (((1 + 1 - sqrt(3))/2)/((1/2)sqrt(3))
= (1 + 1 -sqrt(3))/(sqrt(3))
= (2 - sqrt(3))/sqrt(3)
= 2/sqrt(3) - sqrt(3)/sqrt(3)
= (2/3)sqrt(3) - 1