证明：
因为（cos4αsin2α-sin4αcos2α)/cos2α=sin(2α-4α)/cos2α
=-sin2α/cos2α=-tan2α=-2tanα/(1-tanα²)
=2tanα/(tanα²-1)
所以：结论成立.
求证cos4α*tan2α-sin4α=2tanα/tan方α-1
求证cos4α*tan2α-sin4α=2tanα/tan方α-1
数学人气：807 ℃时间：2020-01-30 08:00:46
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