Definition of "cosine"
noun:
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In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.
from Wiktionary, Creative Commons Attribution/Share-Alike License