Cosine (cos) Calculator
cos() function
Cosine is the trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
This is an online free cos calculator. You can calculate value of cos() trignometric function easily using this tool.
Important Abbreviations to remember
- SOH: Opposite / Hypotenuse (Sine)
- CAH: Adjacent / Hypotenuse (Cosine)
- TOA: Opposite / Adjacent (Tangent)
Interactive animation of Sine & Cosine functions
Drag the red dot around to see how it affects the sine and cosine values below.
Understanding the Main Trigonometric Functions
In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Degrees and Radians are units of measuring these angles. Degrees originated as an unit to measure how far constellations moved in a day (1 degree ~ 1 day of movement). Degrees measure angles by how far we tilted our heads(Observer's view point). Radians measure angles by distance traveled(Movers's view point).