cos^4 X - 2 sin ^2 X cos ^2 X - 3 sin ^4 x= 0
(cos²x-3sin²x)(cos²x+sin²x)=0
cos²x-3sin²x=0
cos²x=3sin²x
cosx=±√3sinx
tanx=±√3/3
x=kπ±π/6
三角函数方程 cos^4 X - 2 sin ^2 X cos ^2 X - 3 sin ^4 = 0 如何解出 X ,
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