Cosine function
The cosine function is a periodic trigonometric function that maps a real number or angle to a value between −1 and 1.
Math for Web Design
cos() is a CSS mathematical function that returns the cosine of an angle.
- How it is used
- Positions horizontal circle coordinates and drives repeating frontend motion effects.
- How deep it goes
- Defines cosine through right triangles and unit circles, then works through CSS and JavaScript layout and animation uses.
- Examples
- Demonstrates a six-item circular menu and a swinging pendulum element.
- What you can do after
- Apply it via CSS cos() or Math.cos() to calculate horizontal circular positions and oscillating values.
Julia as a Second Language
cos is a Julia function that computes the cosine of an angle or numeric value.
- How it is used
- Uses cosine to turn measured angles into values for navigation and other triangle-based calculations.
- How deep it goes
- Explains cosine through navigation, then implements unit-aware methods and conversions without developing a cosine approximation.
- Examples
- Uses lighthouse navigation, sextant angle measurement, Radian and DMS types, and unit-aware cos calls.
- What you can do after
- Apply it via Julia’s cos methods to calculate values while making radians or degrees explicit.
Read how Julia as a Second Language explains cosine function →
D3.js in Action, Third Edition
Cosine is a trigonometric function that gives the ratio of the adjacent side to the hypotenuse in a right triangle.
- How it is used
- Positions vertical coordinates for radial SVG axes in a month-based visualization.
- How deep it goes
- Defines the right-triangle ratio and works through coordinate equations, without developing broader trigonometric theory.
- Examples
- Uses a circle with twelve month axes, angle calculations, and SVG line endpoints as concrete artifacts.
- What you can do after
- Build radial SVG axes by converting angles and radii into vertical endpoint coordinates.
Read how D3.js in Action, Third Edition explains cosine function →
Related concepts
- rotationused by · A rotation is a geometric transformation that turns points or objects about a fixed center, origin, or axis through an angle while preserving distances and angles.
- positional embeddingused by · A positional embedding is a learned or fixed representation that encodes an element’s position or order in a sequence and is incorporated into its content representation.
- trigonometrykind of · Trigonometry is the branch of mathematics studying relationships among angles, lengths, geometric ratios, coordinates, and periodic functions.
- type-generic macroalternative to · A type-generic macro is a macro-based interface whose expansion selects or adapts operations according to the types of its arguments or associated objects.
- operatorkind of · An operator is a symbol, keyword, or language construct that specifies an operation on one or more operands.
- sine functionproduced by · The sine function is a periodic trigonometric function that maps a real number or angle to a value between −1 and 1.
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