✔ 最佳答案
tan x + cot x = 4√3/3
3tanx + 3 = 4√3tan x <--- 整條式乘3tan x
3tanx - 4√3tan x + 3 = 0
[tan x-√(1/3)](tan x-√3)=0
tan x= √(1/3) or tan x = √3
x= 30, 210 or x = 60, 240
希望幫到你 =]
2008-09-15 21:34:36 補充:
30, 60, 210, 240 均有度數
2008-09-20 10:11:10 補充:
應該係:
3tan²x + 3 = 4√3tan x
3tan²x - 4√3tan x + 3 = 0