原式=cos10*(1+√3sin10/cos10)/sin40
=(cos10+√3sin10)/sin40
=2(1/2cos10+√3/2sin10)/sin40
=2(sin30cos10+cos30sin10)/sin40
=2sin40/sin40
=2
原式=cos10*(1+√3sin10/cos10)/sin40
=(cos10+√3sin10)/sin40
=2(1/2cos10+√3/2sin10)/sin40
=2(sin30cos10+cos30sin10)/sin40
=2sin40/sin40
=2