(sin10/cos10 * cos10-根号3 * cos10) / sin50= (sin10 - 根号3 * cos10) / sin50= 2(1/2 * sin10 - 根号3/2 * cos10) / sin50= 2(cos60 * sin10 - sin60 * cos10) / sin50= 2(sin(60-10)) / sin50= 2单位均为"度"....