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Math.prototype.acos() Method in Math Class of Javascript Syntax with Examples
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Usage 
The Math.acos() function is used to return the arccosine value of given number.
Syntax 
Math.acos(Number)
Example
var a=Math.acos(0);        
var b=Math.acos(2);

document.write("A = "+a);
document.write("B = "+b);
Output 
A = 1.5707963267948966
B = NaN
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