若角a,β 满足 -π/2

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若角a,β 满足 -π/2
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若角a,β 满足 -π/2
若角a,β 满足 -π/2

若角a,β 满足 -π/2
负派到零

若角a,β 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 若角A.B满足-π/2-π/2- 若角α,β,满足-π/2 若角α,β满足-π/2 若角α,β满足π/-2 若角α、β满足π/-2 若角α、β满足π/-2 若角a,b满足-∏/2 若角a,b满足-派/2