[中學] 統測數學b
大家好
小弟想問
為什麼由 0小於等於sita小於pi
就可以推導出 x = -3
另外也想知道如何從題目知道 [ 0小於等於sita小於pi ]
謝謝大哥大姐們!
http://i.imgur.com/f33Obsb.jpg
![](https://i.imgur.com/f33Obsb.jpg)
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