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Trigonometric Cosine Function - Cos(deg)

Cosine or Cos function is defined as a value (or the ratio) obtained by dividing the Adjacent Side by the Hypotenuse (the largest side AC that joins the two sides AB and BC that are at 90 degrees to each other in the triangle shown beside) of the reference angle in a Right Angled Triangle. The value of Cosine function varies from -1 to +1 (Table A below shows values for key angles that are between 0 and 360 degrees). Right Angled Triangle
The Inverse value of Cosine or ACos(x) gives the value of x in degrees (ACos(0.5) = 30 degrees etc.).

Cosine(x) = AB/AC Cosine(y) = BC/AC
     Cos(x) = Adjacent Side/Hypotenuse = AB/AC      Cos(y) = Adjacent Side/Hypotenuse = BC/AC





Reference and Related information and links:
Cosine Wave Y-Plot
Sine or Sin Function - Sin(degree)
Tangent or Tan Function - Tan(degree)
Various Mathematical Abbreviations - Math


Last Revised on: November 11th, 2023




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