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hatcattrongthienha
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
1.3cos(1-căn sinx)-cos2x=2*căn sinx.sin^2x-1
cac ban co giup minh nhe.Thanks.To dat căn sinx=t nhung ko the bieu dien cosx theo t nen k giai duoc
cac ban co giup minh nhe.Thanks.To dat căn sinx=t nhung ko the bieu dien cosx theo t nen k giai duoc