Compute the tangent of an angle measured in degrees.
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> Compute the [tangent][trigonometric-functions] of an angle measured in degrees.
``bash`
npm install @stdlib/math-base-special-tand
`javascript`
var tand = require( '@stdlib/math-base-special-tand' );
#### tand( x )
Evaluates the [tangent][trigonometric-functions] of x (in degrees).
`javascript
var v = tand( 0.0 );
// returns 0
v = tand( 60.0 );
// returns ~1.73
v = tand( 90.0 );
// returns Infinity
v = tand( NaN );
// returns NaN
`
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var tand = require( '@stdlib/math-base-special-tand' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -180.0, 180.0, opts );
logEachMap( 'tand(%0.4f) = %0.4f', x, tand );
`
*
`c`
#include "stdlib/math/base/special/tand.h"
#### stdlib_base_tand( x )
Evaluates the [tangent][trigonometric-functions] of x (in degrees).
`c
double out = stdlib_base_tand( 0.0 );
// returns 0.0
out = stdlib_base_tand( 60.0 );
// returns ~1.73
`
The function accepts the following arguments:
- x: [in] double input value.
`c`
double stdlib_base_tand( const double x );
`c
#include "stdlib/math/base/special/tand.h"
#include
int main( void ) {
const double x[] = { 0.0, 30.0, 45.0, 60.0, 90.0 };
double y;
int i;
for ( i = 0; i < 5; i++ ) {
y = stdlib_base_tand( x[ i ] );
printf( "tand(%lf) = %lf\n", x[ i ], y );
}
}
`
*
- [@stdlib/math-base/special/tan][@stdlib/math/base/special/tan]: evaluate the tangent of a number.
- [@stdlib/math-base/special/cosd][@stdlib/math/base/special/cosd]: compute the cosine of an angle measured in degrees.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[trigonometric-functions]: https://en.wikipedia.org/wiki/Trigonometric_functions
[@stdlib/math/base/special/tan]: https://www.npmjs.com/package/@stdlib/math-base-special-tan
[@stdlib/math/base/special/cosd]: https://www.npmjs.com/package/@stdlib/math-base-special-cosd