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)=
已知cos(α-π/6)+sinα=4/5 根号3,则sin(α+7/6π)=?
已知α,β∈(3/4π,π),sin(α+β)=-3/5,sin(β-π/4)=12/13,则cos(α+π/4)=?
若(sinα+cosα)/(sinα-cosα)=2 则sin(α-5π)·sin(3π/2-α)=?
若sinα+cosαsinα−cosα=2,则sin(α-5π)•sin(3π2-α)等于( )
已知α∈(π,2π) sinα+cosα=1/5 求sinα*cosα sinα-cosα
若sinα-cosα=-1/5,α∈(3/2π,7/4π),求sinα与cosα 若sin(α+β)=1/2,sin(α
已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第三象限角,求sin(β+5π/4)的值
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)=
已知cos(α-π/6)+sinα=(4倍根号3)/5,则sin(α+7π/6)=
已知cos(π/2+α)=sin(α-π/2) 求sin(π-α)-cos(π+α)/cos(5π/2 -α)+2sin
1.化简根号2cos x - 根号6sin x2.已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第
已知sinα+cosα=1/5,α∈(0,π),求tanα,sinα6次幂+cosα6次幂