已知α,β∈(π/3,5π/6),若sin(α+π/6)=4/5,cos(β-5π/6)=5/13,则sin(α-β)=
1个回答
∵α,β∈(π/3,5π/6)
==>π/2
相关问题
已知α,β∈(3/4π,π),sin(α+β)=-3/5,sin(β-π/4)=12/13,则cos(α+π/4)=?
0<β<π/6<α<2π/3,cos(α+π/3)=-5/13 sin(β+2π/3)=3/5 ,求sin(α+β)?
已知α,β属于(3π/4,π),sin(α+β)=-3/5,sin(β-π/4)=12/13,求cos(α+π/4)
已知sinα-cosα=-根号5/5,α∈(0,π/4),sin(β-π/4)=3/5,β∈(π/
已知cos(α-β)=-4/5,sin(α+β)=-3/5,π/2<α-β<π,3π/2<α+β<
cos(α+β)=3/5,sin(β-π/4)=5/13,α.β∈(0,π/2),求cos(α+π/4).
已知sin(α-β)=3/5,sin(α+β)=-3/5,且α-β∈(π/2,π),α+β∈(3π/2,2π),求cos
已知sin(α-β)=5/13,sin(α+β)=-4/5,且α-β属于(π/2,π),α+β属于(3π/2,2π) 求
已知α,β属于3π/4到π sin(α+β)=-3/5 sin(β—π/4)=12/13 求cos(α+π/4)=?
若sin(α+β)=4/5,sin(α-β)=-3/5,其中α+β∈(π/2,π),α-β∈(-π/2,0),则sin2