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Mathematics, 14.10.2019 00:20 chinnellepug8198
If 180° < α < 270°, cos α = −817, 270° < β < 360°, and sin β = −45, what is cos (α + β)?
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If 180° < α < 270°, cos α = −817, 270° < β < 360°, and sin β = −45, what is cos (...
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