tan(-α +3/2派)
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![tan(-α +3/2派)](/uploads/image/z/561637-37-7.jpg?t=tan%EF%BC%88-%CE%B1+%2B3%2F2%E6%B4%BE%EF%BC%89)
tan(-α +3/2派)
tan(-α +3/2派)
tan(-α +3/2派)
tan(-α +3/2π)
=tan(2π-π/2-α )
=tan(-α -π/2)
=-tan(α +π/2)
=-sin(α +π/2)/cos(α +π/2)
=sinα/cosα
=tanα
tan(-α +3/2π)
=tan[(-α +3/2π)-π]
=tan(1/2π-α )
=cotα