Z
zaythui
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
tìm GTNN và GTLN của $Sin^4a+CoSin^4a$ bết $Sin^4a + CoSin^4a=1- 2Cosin^2asin^2a$
b) $Sin^6a+ CoSin^6a$, bết $Sin^6a + CoSin^6a=1- 3Cosin^2asin^2a$
b) $Sin^6a+ CoSin^6a$, bết $Sin^6a + CoSin^6a=1- 3Cosin^2asin^2a$
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