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(1+tan7∘)(1+tan17∘)(1+tan28∘)(1+tan38∘)= ? \large (1+\tan7^\circ)(1+\tan17^\circ)(1+\tan28^\circ)(1+\tan38^\circ) = \, ? (1+tan7∘)(1+tan17∘)(1+tan28∘)(1+tan38∘)=?
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