若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0

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若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0若sin(3派/4+α)=5/13,cos(派/4-α)=3/5

若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0
若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0

若sin(3派/4+α)=5/13,cos(派/4-α)=3/5,0
哪里有β?
3π/4