化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)
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化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-
化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)
化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)
化简sin(nπ+α)cos(nπ-α)/cos((n+1)π-α)
楼上的没有分类讨论.
1,若n为奇数,则sin(nπ+α)=-sinα;cos(nπ-α)=-cosα;cos((n+1)π-α)=cosα,所以原式=sinα
2,若n为偶数,则sin(nπ+α)=sinα;cos(nπ-α)=cosα;cos((n+1)π-α)=-cosα,所以原式=-sinα
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