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Mathematics, 04.03.2020 04:00 ghostboy2001

Angle α lies in quadrant II, and tanα=−12/5 . Angle β lies in quadrant IV, and cosβ=3/5.
What is the exact value of cos(α−β) ?
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cos(α−β) = __

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Angle α lies in quadrant II, and tanα=−12/5 . Angle β lies in quadrant IV, and cosβ=3/5.
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