Mathematics, 24.11.2020 02:00, maritzahernandez32
Suppose that the terminal side of angle alphaα lies in Quadrant I and the terminal side of angle betaβ lies in Quadrant IV. If sine alpha equals five thirteenthssinα= 5 13 and cosine beta equals StartFraction 6 Over StartRoot 85 EndRoot EndFractioncosβ= 6 85, find the exact value of cosine left parenthesis alpha plus beta right parenthesiscos(α+β).
Answers: 3
lies in the first quadrant.
lies in the fourth quadrant.
and 
(given)
(IVth quadrant)
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Suppose that the terminal side of angle alphaα lies in Quadrant I and the terminal side of angle bet...
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