若cos2a/sin(a-TT/4)=负根号2/2,则cosa+sina=?
若cos2a/sin(a-TT/4)=负根号2/2,则cosa+sina=?
若sin(a-π/4)/cos2a=-根号2,则sina+cosa=
若cos2a/sin(a-45°)=-根号2/2,则cosa+sina的值为?
cos2a/sin(a-π/4) =-根号(2)/2,则cosa+sina的值为?
若sin(a减4分之派)分之cos2a=负2分之根号2,则sina加cosa的值为?急
若cos2a/sin(a-π/4)=-根号2/2 则sina+cosa 的值为多少?
cos2a/sin(a-pai/4)=-根号2/2求cosa+sina
若cos2a/sin(a-π/4)=-√2/2,则cosa+sina等于多少?
若cos2a/sin((a-(π/4))=-(√2)/2,则cosa+sina的值为
若 cos2a/sin(a-π/4)= -√2/2,求cosa+sina的值.
已知sina+cosa=1-根号3/2,a属于(0,π),则cos2a=
已知sina+cosa=根号2/2,0<a<3π/4,则sin2a=?,cos2a=?