2cos55°-根號3倍sin5°除以cos5°

2cos55°-根號3倍sin5°除以cos5°


原式=[2cos(60-5)-√3sin5)]/cos5
=[2(1/2cos5+√3/2sin5)-√3sin5]/cos5
=(cos5+√3sin5-√3sin5)/cos5
=cos5/cos5
=1