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Harris Amjad

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The ** cos() function** in Ruby calculates the cosine of a number. To be more specific, it returns the cosine of a number in radians.

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

function.

Note:

- This function is present in the
`Math`

module.- This
`cos()`

function only works for right-angled triangles.

```
cos(num)
```

This function requires a `number`

that represents an `angle`

in `radians`

as a parameter.

To convert `degrees`

to `radians`

, use the following formula.

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

`cos()`

returns the `cosine`

of a number that is sent as a parameter. The return value is in the range `[-1,1]`

.

#positive number in radiansputs "The value of cos(2.3) : ", Math.cos(2.3)#negative number in radiansputs "The value of cos(-2.3) : ", Math.cos(-2.3)#converting the degrees angle into radians and then applying cos()#degrees = 180#PI = 3.14159265result = 180.0 * (Math::PI / 180.0)puts "The value of cos(#{result}) : ", Math.cos(result)

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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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