若角a,b满足-π/2

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若角a,b满足-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
-π/2所以-π/2<-b<π/2
-π/2所以-π<2a<π
相加
-3π/2<2a-b<3π/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 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,b满足-90 若角a,β 满足 -π/2 已知a,b满足-派/2 设a,b满足-(pai/2) a,b满足0 a,b满足0