知sin(3π-α)=根号2 sin(π-β),根号3 cos(-α)= - 根号2 cos(π+β) 且0
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
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
若sin(3π-2)=根号2sin(2π+β),根号3cos(-α)=-根号2cos(π+β)
已知cos(π/2+α)=根号2cos(3π/2-β),根号3sin(3π/2+α)=-根号2sin(π/2-β),且0
已知sinα=根号2sinβ,根号3cosα=根号2cosβ,且0<α,β<π,求α和β的值.
已知sinα+cosα=三分之根号二,sinα-cosα=-4/3,且α∈(-π/2,0),计算(1+sin2α+cos
已知sin(3π -a)=根号2sin(2π +b),根号3cos(-a)=-根号2cos(π +b)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sinα+sinβ-根号2=0 cosα+cosβ-2根号2/3=0 求cos(α-β)的值?