mathjs/src/function/trigonometry/acot.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

import { factory } from '../../utils/factory'
import { deepMap } from '../../utils/collection'
import { acotNumber } from '../../plain/number'

const name = 'acot'
const dependencies = ['typed', 'BigNumber']

export const createAcot = /* #__PURE__ */ factory(name, dependencies, ({ typed, BigNumber }) => {
  /**
   * Calculate the inverse cotangent of a value, defined as `acot(x) = atan(1/x)`.
   *
   * For matrices, the function is evaluated element wise.
   *
   * Syntax:
   *
   *    math.acot(x)
   *
   * Examples:
   *
   *    math.acot(0.5)           // returns number 0.4636476090008061
   *    math.acot(math.cot(1.5)) // returns number 1.5
   *
   *    math.acot(2)             // returns Complex 1.5707963267948966 -1.3169578969248166 i
   *
   * See also:
   *
   *    cot, atan
   *
   * @param {number | Complex | Array | Matrix} x   Function input
   * @return {number | Complex | Array | Matrix} The arc cotangent of x
   */
  const acot = typed(name, {
    number: acotNumber,

    Complex: function (x) {
      return x.acot()
    },

    BigNumber: function (x) {
      return new BigNumber(1).div(x).atan()
    },

    'Array | Matrix': function (x) {
      return deepMap(x, acot)
    }
  })

  return acot
})