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Tangent Cotangent Cosecant and Secant of Acute
Solution of RightAngled Triangles
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JSTOR: Elementary Plane Trigonometry
A Concise Trigonometry. By shj Cox. Pp. vii, 183, xiv. 3s. Od. 1938. (Rivingtons) Both Beethoven and Sydney Smith wrote variations on " The Blue Bells of ...