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Find the exact value of cos (a + B), given that sin a = _ and sin B = -- , with a in quadrant

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Find the exact value of cos (a + B), given that sin a = _ and sin B = -- , with a in quadrant I and B in quadrant IV. cos (a + p) = (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression

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