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If cos(α + β) = 4/5, sin (α - β) = 5/13 and α, β lie between 0 and π/4, find tan 2α.

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If cos(α + β) = 4/5, sin (α - β) = 5/13 and α, β lie between 0 and π/4, find tan 2α.

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Since, cos(α + β) = 4/5, sin (α - β) = 5/13

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