若角a满足180°

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若角a满足180° 若角a,p满足-90° 若角a,p满足-90° 若角a满足sinacosa 1,若角A满足sinAcosA 若角a,b满足-90 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-∏/2 若角a,b满足-派/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,β 满足 -π/2 若角A,B满足-π/2 若角A、B满足-π/2