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When I use Math.sin(90) for calculating Sine of 90 degrees in javascript it returns 0.8939966636005565, but sin(90) is 1. Is there a way to fix that? I need accurate values for any angle.
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button calculate value of 90 degrees.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction(){
document.getElementById("demo").innerHTML=Math.sin(90);
}
</script>
725
The Math. sin() method in Javascript is used to return the sine of a number. The Math. sin() method returns a numeric value between -1 and 1, which represents the sine of the angle given in radians.
The sine is equal to the ratio of the side opposite the angle and the hypotenuse of the right-angled triangle they define. The angle must be measured in radians. To convert an angle measured in degrees to its radian equivalent, multiply the angle by π, represented in Squirrel by the constant PI , and divide by 180.
The Math. cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle. Because cos() is a static method of Math , you always use it as Math. cos() , rather than as a method of a Math object you created ( Math is not a constructor).
Also, ∞ is undefined thus, sin(∞) and cos(∞) cannot have exact defined values. However, sin x and cos x are periodic functions having a periodicity of (2π). Thus, the value of sin and cos infinity lies between -1 to 1. There are no exact values defined for them.
Math.sin expects the input to be in radian, but you are expecting the result of 90 degree. Convert it to radian, like this
console.log(Math.sin(90 * Math.PI / 180.0));
# 1
As per the wikipedia's Radian to Degree conversion formula,
Angle in Radian = Angle in Degree * Math.PI / 180
The sin function in Javascript takes radians, not degrees. You need to convert 90 to radians to get the correct answer:
Math.sin(90 * (Math.PI / 180))
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