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arborize
arborvitae
arbour
arbovirus
arbutus
ARC
arc
arc cosecant
arc cosine
arc cotangent
Arc de Triomphe
arc furnace
arc light
arc secant
arc second
arc sine
arc tangent
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arc cosine
arc co·sine (plural arc co·sines)


noun 
Definition:
 
mathematics inverse cosine: the inverse of the cosine function
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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