cos(a-b/2)=-1/9,sina(a/2-b)=2/3,且派>a>二分之派,0

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cos(a-b/2)=-1/9,sina(a/2-b)=2/3,且派>a>二分之派,0
cos(a-b/2)=-1/9,sina(a/2-b)=2/3,且派>a>二分之派,0

cos(a-b/2)=-1/9,sina(a/2-b)=2/3,且派>a>二分之派,0
pi/2