=根号下（1-2sin10°cos10°）/sin10°-根号下(cos170°^2)=根号下(sin10°^2+cos10°^2-2sin10°cos10°) / sin10°-cos10°=(sin10°-cos10°)的绝对值 / sin10°-cos10°=cos10°-sin10° / sin10°-cos10°= -1...