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May 24, 2012
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Dictionary


arc' co'sine




Trig.the angle, measured in radians, that has a cosine equal to a given number. Abbr.: arc cos; Symbol: cos-1 Also called inverse cosine.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

arc cosecantarc cotangent
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