tan(π/8)-cot(π/8)=?A.-2 B.-1 C.1 D.2
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tan(π/8)-cot(π/8)=?A.-2B.-1C.1D.2tan(π/8)-cot(π/8)=?A.-2B.-1C.1D.2tan(π/8)-cot(π/8)=?A.-2B.-1C.1D.2t
tan(π/8)-cot(π/8)=?A.-2 B.-1 C.1 D.2
tan(π/8)-cot(π/8)=?
A.-2 B.-1 C.1 D.2
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
化简tan(a)*cot(π-a)=
tan(π/8)-cot(π/8)=?A.-2 B.-1 C.1 D.2
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tanα=-cotθ θ属于(π/2,π)
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化简:tan派/8+cot派/12=?
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