h*l
发帖数: 19 | 1 Really, where is the #? I actually don't have much
time now, hehe.
By the way, the proof below is actually calculated
by me via hand for fun. So, it's not a joke. And
the calculation is not hard.
A conclusion is although trigonomy technique was
usually consider to be not wize for middle level
Euclid geometry problem, this view is COMPLETELY
mechanically changed now. The tg(t/2) method is
almost always straightforwards without much calculation.
But one problem is it's still "直观“，so some time
we h |
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