化简:(cos2a-cos²a)/(sin²a-1) =
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化简:(cos2a-cos²a)/(sin²a-1) =
化简:(cos2a-cos²a)/(sin²a-1) =
化简:(cos2a-cos²a)/(sin²a-1) =
(cos2a-cos²a)/(sin²a-1)
=(cos²a-sin²a-cos²a)/(sin²a-1)
=sin²a/(1-sin²a)
=sin²a/cos²a
=tan²a
tan²a
(cos2a-cos²a)/(sin²a-1)
=(2cos²a-1-cos²a)/(-cos²a)
=(cos²a-1))/(-cos²a)
=-sin²a/(-cos²a)
=tan²a