MathDB
sin 10,sin 20, cos 10, cos 20

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October 16, 2005
trigonometry

Problem Statement

sin⁡10∘+sin⁡20∘cos⁡10∘+cos⁡20∘\frac{\sin 10^\circ + \sin 20^\circ}{\cos 10^\circ + \cos 20^\circ} equals A. tan⁡10∘+tan⁡20∘\tan 10^\circ + \tan 20^\circ B. tan⁡30∘\tan 30^\circ C. 12(tan⁡10∘+tan⁡20∘)\frac{1}{2} (\tan 10^\circ + \tan 20^\circ) D. tan⁡15∘\tan 15^\circ E. 14tan⁡60∘\frac{1}{4} \tan 60^\circ
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