/**
 *
 * @param {number} x0
 * @param {number} y0
 * @param {number} z0
 * @param {number} x1
 * @param {number} y1
 * @param {number} z1
 * @returns {number} value between -1 and 1, cosine of the angle between vectors
 */
export function v3_angle_cos_between(x0: number, y0: number, z0: number, x1: number, y1: number, z1: number): number;
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