已知等式变形得：(1+sinα)(1−sinα)(1−sinα)2-(1−sinα)(1+sinα)(1+sinα)2=|cosα|1−sinα-|cosα|1+sinα=|cosα|(1+sinα−1+sinα)cos2α=2sinα|cosα|cos2α=2sinα|cosα|=-2tanα=−2sinαcosα，∴|...