sin (A + B) = sin AcosB + sin B cos A
sin A = - sqrt ( 3^2 - (sqrt 2)^2 ) / 3 = - sqrt (9 - 2) /3 = -sqrt (7) /3
sin B = 4/5 cos B = 3/5
So we have
[-sqrt (7) / 3] * [ 3 / 5 ] + [4 / 5] * [ - sqrt (2) / 3 ] =
-3sqrt (7) - 4sqrt (2)
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