高一数学化简根号下[(1+sinα)/(1
化简根号下[(1+sinα)/(1-sina)]-根号下[(1-sinα)/(1+sinα)],其中α为第二象限角
[(1+sinα)/(1-sina)]-根号下[(1-sinα)/(1+sinα)]= [(1+sinα)^2/(1-sina)(1+sinα)]- 根号下[(1-sinα)^2/(1+sinα)(1-sinα)]= [(1+sinα)^2/(cosα)^2]- 根号下[(1-sinα)^2/(cosα)^2]= (1+sinα)/(-cosα)-(1-sinα)/(-cosα)= [(-1-sinα)+(1-sinα)]/cosα= -2sinα/cosα= -2tanα