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Let cos(α + β) = 4/5 and let sin(α + β) = 5/13, where 0 ≤ α, β ≤ π/4, then tan 2α =

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Let cos(α + β) = 4/5 and let sin(α + β) = 5/13, where 0 ≤ α, β ≤ π/4, then tan 2α = 

(1) 56/33

(2) 19/12

(3) 20/7

(4) 25/16

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(1) 56/33

cos(α + β) = 4/5

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