Mathematics

Mathematics

Problem

1−tan⁡230∘1+tan⁡230∘\frac{1-\tan^2 30^\circ}{1+\tan^2 30^\circ} is equal to (1) sin⁡60∘\sin 60^\circ (2) cos⁡60∘\cos 60^\circ (3) tan⁡60∘\tan 60^\circ (4) sec⁡60∘\sec 60^\circ

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