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# What is tan() in Dart? Harris Amjad

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The tan() function returns the tangent of a number in radians.

The mathematical representation of the tan() function is shown below.

Mathematical representation of the tangent function

Note:

• dart:math is required for this function.
• The tan() function only works for right-angled triangles.

### Syntax

double tan(double num)


### Parameter

This function requires a number, num, that represents an angle in radians.

In order to convert degrees to radians, use the following formula:

radians = degrees * ( pi / 180 )


### Return value

tan() returns the tangent of the number that is sent as a parameter.

### Code

import 'dart:convert';import 'dart:math';void main() {    //positive number in radians    print("The value of tan(2.3): ${tan(2.3)}"); // negative number in radians print("The value of tan(-2.3):${tan(-2.3)}");    //converting the degrees angle into radians and then applying tan()    // degrees = 45.0    // PI = 3.14159265    // result first converts degrees to radians then apply tan    double result=tan(45.0 * (pi / 180.0));    print("The value of tan(45.0 * (pi / 180.0)): \${result}");}

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CONTRIBUTOR 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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