Definition of "cos" []

• See romaine. (noun)
• Cosine (abbreviation)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "You know for example, that: sin (4x) = 2sin (2x) cos (2x) sin (2x) = 2sin (x) cos (x) cos (2x) = cos² (x) - sin² (x), etc ..."
• "cos A + iSinA + cos C +iSin C = 2 (cos B+ iSinB) cos A+Cos C +i (sin A +sin c) = 2cosb + i2sin b cos a +cos c = 2 cos b sin a +sin c = 2 sin b"
• "Again dy_2 = - 3l cos [theta] {4 cos² [theta] - 3} d [theta] = - 3 {4 cos²"