Math.acos()

Math.acos() 함수는 주어진 수의 아크코사인 값을 숫자(라디안)로 반환합니다. 즉,

$$\forall x \in [{-1};1],\;\mathtt{\operatorname{Math.acos}(x)} = \arccos(x) = \text{ the unique } \; y \in [0; \pi] \, \text{such that} \; \cos(y) = x$$

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구문

Math.acos(x)

매개변수

x

각도를 나타내는 라디안.

반환 값

-1과 1 사이의 값이 주어진 경우, 그 값의 아크코사인. 아닐 경우 NaN

설명

The Math.acos() method returns a numeric value between 0 and π radians for x between -1 and 1. If the value of x is outside this range, it returns NaN.

Because acos() is a static method of Math, you always use it as Math.acos(), rather than as a method of a Math object you created (Math is not a constructor).

예제

Using Math.acos()

Math.acos(-2);  // NaN
Math.acos(-1);  // 3.141592653589793
Math.acos(0);   // 1.5707963267948966
Math.acos(0.5); // 1.0471975511965979
Math.acos(1);   // 0
Math.acos(2);   // NaN

For values less than -1 or greater than 1, Math.acos() returns NaN.

명세

브라우저 호환성

See also

• Math.asin()
• Math.atan()
• Math.atan2()
• Math.cos()
• Math.sin()
• Math.tan()