Subjects: “...Trigonometry....”

Table of Contents: “... alias Regiomontanus. Trigonometry becomes analytic -- Francois Viete. Measuring heaven and earth...”
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Table of Contents: “... to Zheng He--mapping of India--trigonometry and steam--contours of modern India...”

Table of Contents: “... notes on certain theorems in higher trigonometry ; The integral and further remarks on the integral...”