If $α$ and $β$ are acute, $sin α = \frac{4}{5}$ and $sin β = \frac{12}{13}$ , find $cos (α + β)$ .

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If $α$ and $β$ are acute, $sin α = \frac{3}{5}$ and $sin β = \frac{5}{13}$ , find $cos (α + β)$ .
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If alpha and beta are… | Wazari Exam (Iraq Baccalaureate) - Scientific Branch