若角A.B满足-π/2-π/2-
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若角A,B满足-π/2
若角A、B满足-π/2
若角A、B满足-π/2
若角a,b满足-π/2
若角a,b满足-π/2
若角A、B满足-π/2
若角A、B满足-π/2
若角A,B满足-π/2
若角A、B满足-π/2
若角A.B满足-π/2-π/2-
若角a,b满足-∏/2
若角a,b满足-派/2
若角a,β 满足 -π/2
【急】已知锐角A,B满足A+B>2分之π,证明sinA>cosB
已知向量a,b满足|b|=a·b=2,=π/3,则|a|=
设向量a ,b 满足|a-b|=2,|a |=2 ,且a-b与a的夹角为1/3乘π,求绝对值b
已知a,b满足-派/2
设a,b满足-(pai/2)