text: module.exports = rotate
  
  /**
   * Rotates a mat2 by the given angle
   *
   * @alias mat2.rotate
   * @param {mat2} out the receiving matrix
   * @param {mat2} a the matrix to rotate
   * @param {Number} rad the angle to rotate the matrix by
   * @returns {mat2} out
   */
  function rotate(out, a, rad) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3]
    var s = Math.sin(rad)
    var c = Math.cos(rad)
    out[0] = a0 *  c + a2 * s
    out[1] = a1 *  c + a3 * s
    out[2] = a0 * -s + a2 * c
    out[3] = a1 * -s + a3 * c
    return out
  }
  