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E.B. Wright
Five-figure table of the functions 1/[1-Tan(theta)] and 1/[1-Cot(theta)] for the range -90 ̊(1') 90̊
![Five-figure table of the functions 1/[1-Tan(theta)] and 1/[1-Cot(theta)] for the range -90 ̊(1') 90̊](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)