take the arctangent of a number in typescript

The Math library in TypeScript includes a method called `atan` which can be used to compute the arctangent value of a number. The `atan` method takes a single argument which is the number whose arctangent value needs to be calculated. The return value of this method is in radians.

Here's an example of how to use `atan` in TypeScript:

```index.ts```const x = 1;
const arctanValue = Math.atan(x);
console.log(arctanValue); // Output: 0.7853981633974483
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In this example, we are computing the arctangent value of 1 and storing the result in the `arctanValue` variable. The arctangent value of 1 is pi/4 radians or 45 degrees.

If you want to calculate the arctangent value in degrees, you can use the `toDegrees` method provided by the Math library:

```index.ts```const x = 1;
In this example, we are first computing the arctangent value in radians and then converting it to degrees using the `toDegrees` method. The resulting value is 45 degrees.