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Trigonometric functions: Difference between revisions
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JavaScript's <tt>Math</tt> class contains all six functions and is automatically included as part of the language. The functions all accept radians only, so conversion is necessary when dealing with degrees. The <tt>Math</tt> class also has a <tt>PI</tt> constant for easy conversion.
<lang javascript>
//sine▼
window.alert(Math.sin(radians) + " " + Math.sin(degrees * Math.PI / 180));▼
//cosine▼
arcsin = Math.asin(sine),
window.alert(Math.cos(radians) + " " + Math.cos(degrees * Math.PI / 180));▼
arccos = Math.acos(cosine),
//tangent▼
arctan = Math.atan(tangent);
window.alert(Math.tan(radians) + " " + Math.tan(degrees * Math.PI / 180));▼
//arcsine▼
▲// sine
▲var arcsin = Math.asin(Math.sin(radians));
▲// cosine
▲// tangent
▲// arcsine
window.alert(arcsin + " " + (arcsin * 180 / Math.PI));
// arccosine
▲var arccos = Math.acos(Math.cos(radians));
window.alert(arccos + " " + (arccos * 180 / Math.PI));
// arctangent
▲var arctan = Math.atan(Math.tan(radians));
window.alert(arctan + " " + (arctan * 180 / Math.PI));</lang>
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