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4 5 Find the exact value of cos (a + [3) if sin a = E and sin [3: W' with u: in quadrant II

4 5 Find the exact value of cos (a + [3) if sin a = E and sin [3: W' with u: in quadrant II and B in quadrant |||. cos (a + [3} = (Simplify your answer. Type a fraction.)

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