已知Sinx=根号5/5 x∈(π/2,3π/2) 则Tan(x-π/4)等于?

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已知Sinx=根号5/5 x∈(π/2,3π/2) 则Tan(x-π/4)等于?
已知Sinx=根号5/5 x∈(π/2,3π/2) 则Tan(x-π/4)等于?

已知Sinx=根号5/5 x∈(π/2,3π/2) 则Tan(x-π/4)等于?
sin²x+cos²x=1
显然 cosx