m与n为共线向量=>(cosα-√2/3)/(-1)=sinα/1-cosα+√2/3 = sinα√2/3 = (sinα+cosα)2/9 = 1+ sin2αsin2α = -7/9tan2α = -7/(4√2)-cosα+√2/3 = sinα√2/3 = (sinα+cosα) .(sinα-cosα)/(sinα-cosα)=...