（tan10°－根号3）×cos10°÷sin50

（tan10°－根号3）×cos10°÷sin50°

2个回答

=[sin10°/cos10°－√3]cos10°/sin50°
=[sin10°－√3cos10°]/sin50°
=2[sin10°cos60°－cos10°sin60°]/sin50°
=2sin(10°－60°)/sin50°
=－2