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Mathematics, 29.10.2019 18:31 shelbycg02

If 180°< α< 270°, cos⁡ α=−8/17, 270°< β< 360°, and sin⁡ β=−4/5, what is cos⁡(α+β)?

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If 180°< α< 270°, cos⁡ α=−8/17, 270°< β< 360°, and sin⁡ β=−4/5, what is cos⁡(α+β)?...
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