Table of circular and hyperbolic tangents and cotangents for radian arguments. Prepared by the Mathematical Tables Project, Work projects administration of the Federal works agency. Conducted under the sponsorship of the National bureau of standards. Lyman J. Briggs, director, National bureau of standards, official sponsor. Arnold N. Lowan, technical director, Mathematical tables project 1943 [LeatherBound]
Mathematical Tables Project (U.S.)
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