Elements of Plane Trigonometry (Classic Reprint) - Hardcover

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Excerpt from Elements of Plane Trigonometry

To deduce sin (a +b), cos (a +b) To deduce sin (a - B), cos (a - B) Fundamental formulas To deduce tan (a +b), tan (a - B), cot (a +b), cot (a - B). To deduce sin 2a, cos 2a, tan 2a.

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