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[主观题]
设tanθ=2,则tan(θ+π)A.-2B.2C.1D.-1/2
设tanθ=2,则tan(θ+π)
A.-2
B.2
C.1
D.-1/2
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设tanθ=2,则tan(θ+π)
A.-2
B.2
C.1
D.-1/2
sin θ·cos θ·tan θ<0,则θ属于()
A.(π/2,π)
B.(π,3π/2)
C.(-√2π/2,0)
D.(-π/2,0)
已知cos2α=5/13(3π/4<α<π),则tanα等于()
A.-3/2
B.-2/3
C.2/3
D.3/2
已知tana、tanβ是方程2x2—4x+1=0的两根,则tan(α+β)=()
A.4
B.-4
C.4/3
D.8
A.最大为θ,最小为cosθ
B.最大为tanθ,最小为cosθ
C.最大为θ,最小为sinθ
D.最大为tanθ,最小为sinθ