(1)原式=（sin10/cos10-√3）*sin80/cos40=(cos80/sin80-√3)*sin80/cos40 =(cos80-√3sin 80)/cos40=-2sin(80-30)/cos40=-2sin50/cos40=-2cos40/cos40=-2(2)原式=(tan60-tan18)/(1+tan60tan18)=tan(60-18)=tan42...