tanx=α,x∈(π/2,π),则有C.x=π+arc tanaD.x=π-arc tana
问题描述:
tanx=α,x∈(π/2,π),则有
C.x=π+arc tana
D.x=π-arc tana
答
tan(x-π)=tanx=α, x-π∈(-π/2,0)
x-π=arctanα
x=π+arctanα
选C