tan10-√3=sin10/cos10-√3=(sin10-√3cos10)/cos10=2sin(10-60)/cos10=-2sin50/cos10sin40(tan10-√3）=-(2sin40sin50)/cos10=-[cos(50-40)-cos(50+40)]/cos10=-cos10/cos10=-1 tan70°cos10°[SQR(3)tan20°—1]=(...