cos(a-b/2)=-3/5,sina(a/2-b)=5/13,且派>a>二分之派,0

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cos(a-b/2)=-3/5,sina(a/2-b)=5/13,且派>a>二分之派,0cos(a-b/2)=-3/5,sina(a/2-b)=5/13,且派>a>二分之派,0cos(a-b/2)=-

cos(a-b/2)=-3/5,sina(a/2-b)=5/13,且派>a>二分之派,0
cos(a-b/2)=-3/5,sina(a/2-b)=5/13,且派>a>二分之派,0