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mastercity
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Câu1:Rút gọn biểu thức :
[tex]\frac{cos4a-cos2a}{sin4a+sin2a}[/tex]
giải giúp mình nha
fhsdjghdfjkghdfjkghdfjkghdfjkghdfjkghdfjkghdfjkghdjk
[tex]\frac{cos4a-cos2a}{sin4a+sin2a}[/tex]
giải giúp mình nha
fhsdjghdfjkghdfjkghdfjkghdfjkghdfjkghdfjkghdfjkghdjk
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