1.已知0
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1.已知01.已知01.已知01、解:由tan(a/2)+1/tan(a/2)=tan(x/2)+cot(x/2)=5/2则:sin(x/2)/cos(x/2)+cos(x/2)/sin(x/2)=5
1.已知0
1.已知0
1.已知0
1、解: 由tan(a/2)+1/tan(a/2)=tan(x/2)+cot(x/2)=5/2 则: sin(x/2)/cos(x/2)+cos(x/2)/sin(x/2)=5/2 [sin^2(x/2)+cos^2(x/2)]/[sin(x/2)cos(x/2)]=5/2 2/[2sin(x/2)cos(x/2)=5/2 2/sin(x)=5/2 5sin(x)=4 sin(x)=4/5 由于0