discussed
a/sinA=b/sinB=c/sinC
a/cosA=b/cosB=c/cosC
tanA=tanB=tanC
tanx为在（0,π/2)上的增函数且大于零
（π/2,π)上的增函数且小于零
ABC三角不能中至少有两个角是锐角,显然A=B=C
故为等边三角形
This is the problem __________________ (discuss) at the next
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