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* @license Apache-2.0
*
* Copyright (c) 2024 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var rad2deg = require( '@stdlib/math/base/special/rad2deg' );
var acos = require( '@stdlib/math/base/special/acos' );
// MAIN //
/**
* Computes the arccosine (in degrees) of a double-precision floating-point number.
*
* @param {number} x - input value
* @returns {number} arccosine (in degrees)
*
* @example
* var v = acosd( 0.0 );
* // returns 90.0
*
* @example
* var v = acosd( 0.5 );
* // returns ~60.0
*
* @example
* var v = acosd( Math.sqrt( 2 ) / 2 );
* // returns ~45.0
*
* @example
* var v = acosd( Math.sqrt( 3 ) / 2 );
* // returns ~30.0
*
* @example
* var v = acosd( NaN );
* // returns NaN
*/
function acosd( x ) {
var rad = acos( x );
return rad2deg( rad );
}
// EXPORTS //
module.exports = acosd;
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