tan−1
AmericanExample Sentences
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Even among the mere computers the series θ = tan - 1⁄3 tan3 θ + 1⁄5 tan5 θ - ..., specially known as Gregory’s series, has ever since been a necessity of their calling.
From Project Gutenberg
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
