△ABC中sin^2A-sin^2C=根号2sinAsinB-sin^2B+则角C为
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△ABC中sin^2A-sin^2C=根号2sinAsinB-sin^2B+则角C为
△ABC中sin^2A-sin^2C=根号2sinAsinB-sin^2B+则角C为
△ABC中sin^2A-sin^2C=根号2sinAsinB-sin^2B+则角C为
如果=右边是根号2倍的sinAsinB……
角C为45度
在△ABC中,求证;sin^(A/2)+sin^(B/2)+sin^(C/2)=1-2sin(A/2)sin(B/2)sin(C/2)
在三角形ABC中sin^A+sin^B=2sin^C,则角C为?
△ABC中sin^2A-sin^2C=根号2sinAsinB-sin^2B+则角C为
在△ABC中 若sin^2A+sin^2B=2sin^2C 则∠C为?
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