Plane and Spherical Trigonometry (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Plane and Spherical Trigonometry

The proofs of formulas are simple but rigorous. The use of directed lines is consistent; the directions of such lines in the figures are usually indicated by arrowheads, and these lines are always read from origin to end. Both trigonometric ratios and trigonometric lines are employed, but at first the ratios are used exclusively until they have become fixed in the mind and have been made familiar by use in the solution of right triangles.

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