已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4

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已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4已知cos(π/4+α)=-3/5,sin(3π

已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4
已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4

已知cos(π/4+α)=-3/5,sin(3π/4+β)=5/13且派/4
派/4