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Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The ** cos() function** in Scala returns the

`cosine`

of a number. To be more specific, it returns the cosine of a number in `radians`

.Figure 1 below shows the mathematical representation of the `cos()`

function.

The

`scala.math._`

header file is required for this function.

This

`cos()`

function only works for right-angled triangles.

```
Double cos(Double number)
```

This function requires a `number`

that represents an `angle`

in `radians`

as a parameter.

To convert `degrees`

to `radians`

, use the formula below.

```
radians = degrees * ( Pi / 180.0 )
```

`cos()`

returns the `cosine`

of a number in `radians`

that is sent as a parameter.

If the parameter value is

or positive infinity or negative infinity, it returns NaN. NaN Not a Number

import scala.math._object Main extends App {//positive number in radiansprintln(s"The value of cos(2.3) = ${cos(2.3)}");// negative number in radiansprintln(s"The value of cos(-2.3) = ${cos(-2.3)}");//converting the degrees angle into radians and then applying cos()// degrees = 45// PI = 3.14159265// result first converts degrees to radians then apply cosprintln(s"The value of cos(45) = ${cos(45 * (Pi / 180))}");//error outputsprintln(s"The value of cos(Double.PositiveInfinity) = ${cos(Double.PositiveInfinity)}");println(s"The value of cos(Double.NegativeInfinity) = ${cos(Double.NegativeInfinity)}");println(s"The value of cos(Double.NaN) = ${cos(Double.NaN)}");}

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Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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