sin(π/4-a)=5/13(0

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sin(π/4-a)=5/13(0
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sin(π/4-a)=5/13(0
sin(π/4-a)=5/13(0

sin(π/4-a)=5/13(0
10/13
令TT/4-a=X a=TT/4-x 2a=TT/2-2X 0