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Mathematics, 04.12.2020 02:20 SoccerHalo
Find the exact value of cos (α+β), given π/2<α<π, π/2<β<π
tan α = -15/8, sin β = 5/13
I need an explanation on how to do it too. Thank you.
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Find the exact value of cos (α+β), given π/2<α<π, π/2<β<π
tan α = -15/8, sin β = 5/13
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