（tan10°-√3）×cos10°/sin50°
=（sin10°/cos10°-√3）×cos10°/sin50°
=（sin10°-√3cos10°）/sin50°
=2（1/2×sin10°-√3/2×cos10°）/sin50°
=2（cos60°sin10°-sin60°cos10°）/sin50°
=2×sin(10°-60°)/sin50°
=-2
化简（tan10度-根号3)乘sin50度分之cos10度（有过程的）
（tan10°-√3）×cos10°/sin50°
=（sin10°/cos10°-√3）×cos10°/sin50°
=（sin10°-√3cos10°）/sin50°
=2（1/2×sin10°-√3/2×cos10°）/sin50°
=2（cos60°sin10°-sin60°cos10°）/sin50°
=2×sin(10°-60°)/sin50°
=-2