tan(π/8)-cot(π/8)=?

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tan(π/8)-cot(π/8)=?
A.-2 B.-1 C.1 D.2

tanπ/8-ctgπ/8
=(sinπ/8)/(cosπ/8)-(cosπ/8)/(sinπ/8)
=[(sinπ/8)^2-(cosπ/8)^2]/(sinπ/8*cosπ/8)
=(-cosπ/4)/[(1/2)*sinπ/4]
=-2
A.-2

tan(π/8)-cot(π/8)=? 求tanπ/8 + cotπ/12的值 1.tan（π/8）-cot（π/8）=________ tan(3/2π-α)=?；cot(-α-π)=? tanα=-cotθ θ属于(π/2,π) tan(π/4-a)=cot(π/4+a) 1)求证cotαcosα/cotα-cosα=tan(α/2+π/4) cot(π/2+α)=tanα吗 tan（派/8）-cot（派/8）=? 化简:tan派/8+cot派/12=? tan（π/8）-cot（π/8）的值为? tanπ/12-cotπ/12