Question 1194583: With 0 < a < b, the figure below shows two angles α and β drawn in the unit circle so that sin(α) = a and sin(β) = -b. Express sin(α + β) in terms of a and b.
Answer by ikleyn(52908)   (Show Source):
You can put this solution on YOUR website! .
With 0 < a < b, the figure below shows two angles α and β drawn in the unit circle
so that sin(α) = a and sin(β) = -b. Express sin(α + β) in terms of a and b.
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As it is posted in your message, the problem's formulation is INCOMPLETE.
To be complete, the wording formulation MUST SAY EXPLICITLY, in which of four quadrants
each of the angles " α " and " β " is located.
It is a necessary condition for the problem to be formulated properly:
without it, the problem CAN NOT be solved correctly.
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