calculates trigonometric ratios and their inverses.

Trigonometrics.js

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
  });

const colors = {
  blue: "\x1b[34m",
  green: "\x1b[32m",
  cyan: "\x1b[36m",
  magenta: "\x1b[35m",
  yellow: "\x1b[33m",
  red: "\x1b[31m",
  reset: "\x1b[0m"
};

const degreesToRadians = (degrees) => degrees * (Math.PI / 180);

const formatNumber = (num, decimalPlaces = 4) => parseFloat(num.toFixed(decimalPlaces));

function calculateRatios(angle, unit = 'degrees') {
  const angleInRadians = unit === 'degrees' ? degreesToRadians(angle) : angle;

  const sine = formatNumber(Math.sin(angleInRadians));
  const cosine = formatNumber(Math.cos(angleInRadians));
  const tangent = Math.abs(angle % 180 === 90) ? "Undefined" : formatNumber(Math.tan(angleInRadians));
  const cotangent = tangent === "Undefined" || tangent === 0 ? "Undefined" : formatNumber(1 / Math.tan(angleInRadians));

  return { sine, cosine, tangent, cotangent };
}

function calculateInverseRatios(value) {
  const radToDeg = 180 / Math.PI;
  return {
    asin: formatNumber(Math.asin(value) * radToDeg),
    acos: formatNumber(Math.acos(value) * radToDeg),
    atan: formatNumber(Math.atan(value) * radToDeg)
  };
}

const displayResults = (angle, unit, ratios) => {
  console.log(`${colors.blue}\nFor an angle of ${angle} ${unit}:${colors.reset}`);
  console.log(`${colors.green}Sine: ${ratios.sine}${colors.reset}`);
  console.log(`${colors.cyan}Cosine: ${ratios.cosine}${colors.reset}`);
  console.log(`${colors.magenta}Tangent: ${ratios.tangent}${colors.reset}`);
  console.log(`${colors.yellow}Cotangent: ${ratios.cotangent}${colors.reset}`);

  console.log(`${colors.yellow}\nInverse Ratios for Sine (asin), Cosine (acos), Tangent (atan):${colors.reset}`);
  console.log(`${colors.green}asin(${ratios.sine}): ${calculateInverseRatios(ratios.sine).asin} degrees${colors.reset}`);
  console.log(`${colors.cyan}acos(${ratios.cosine}): ${calculateInverseRatios(ratios.cosine).acos} degrees${colors.reset}`);
  console.log(`${colors.magenta}atan(${ratios.tangent !== "Undefined" ? ratios.tangent : 0}): ${calculateInverseRatios(ratios.tangent !== "Undefined" ? ratios.tangent : 0).atan} degrees${colors.reset}`);
};

rl.question("Enter an angle: ", (angleInput) => {
  const angle = parseFloat(angleInput);
  rl.question("Enter unit (degrees/radians): ", (unitInput) => {
    const unit = unitInput.toLowerCase();

    if (isNaN(angle) || (unit !== 'degrees' && unit !== 'radians')) {
      console.log(`${colors.red}Invalid input. Please provide a valid number for the angle and unit as 'degrees' or 'radians'.${colors.reset}`);
    } else {
      const ratios = calculateRatios(angle, unit);
      displayResults(angle, unit, ratios);
    }

    rl.close();
  });
});