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tan21∘+tan23∘+tan25∘+⋯+tan287∘+tan289∘= ?\large \tan^2 1^\circ + \tan^2 3^\circ + \tan^2 5^\circ + \cdots+ \tan^2 87^\circ + \tan^2 89^\circ = \ ? tan21∘+tan23∘+tan25∘+⋯+tan287∘+tan289∘= ?
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