sine
  • noun a trigonometric function equal to the length of the side opposite to an angle in a right-angled triangle divided by the hypotenuse
  • For a right triangle, the ratio of the length of the side opposite to an acute angle, to the length of the hypotenuse. This contrasts with cosine, which is the ratio of the length of the side adjacent to an acute angle, to the length of the hypotenuse.

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