若sin(3π-α)=(根号2)sin(2π+β),(根号3)cos(-α)=(-根号2)cos(π+β),
若sin(3π-2)=根号2sin(2π+β),根号3cos(-α)=-根号2cos(π+β)
已知sin(3π-α)=根号2*sin(π-β),根号3*cos(-α)=-根号2*cos(π+β),且α、β∈(0,π
cos(π/2-α)=根号2cos(3/2π+β),根号3sin(3π/2-α)=-根号2sin(π/2+β)且0
已知sin(3π-a)= 根号2sin(π-β),根号3cos(-a)= -根号2cos(π+β),且α β属于(0,π
已知sin(3π-α)=根号二cos(3π/2+β),根号三cos(-α)=负根号二cos(π+β),且0
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cos(π\3-2)=1\3,则cosα+根号3sinα=
已知sin(3π-a)=根号二cos(3π/2+β),根号三cos(-a)=-根号二cos(π+β),且0
已知sinα=根号2 cosβ,tanα=根号3 cotβ,-π/2
已知sinα+sinβ-根号2=0 cosα+cosβ-2根号2/3=0 求cos(α-β)的值?
1、已知2根号3sin^2α+(2根号2-根号3)sinαcosα-根号2cos^2α=0,α∈(π/2,π),求sin
是否存在α∈(-π/2,π/2),β∈(0,π),使等式sin(3π-α)=根号2 cos(π/2-β),根号3COS(