Cos 4pi/3
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![Số nghiệm thuộc khoảng [-4pi/3;pi/2] của phương trình cos (pi+x)+căn 3 ...](https://video.vietjack.com/upload2/quiz_source1/2020/05/131-d20-1589707508.PNG)
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![Valeurs particulières [Trigonométrie]](https://lecluseo.scenari-community.org/2DE/Trigonometrie/res/cercletrigo.png)
![Evaluate each trigonometric function: \[ \cos \frac{4 \pi}{3} \] - YouTube](https://i.ytimg.com/vi/gknziRyS-fE/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGGUgZShlMA8=&rs=AOn4CLCckpmZsPpG-rF31x3eTCyiO_9tBQ)
![sqrt(3[cos((4pi)/9)+isin((4pi)/9)]) - Symbolab](https://www.symbolab.com/images/latexRender?width=400&height=150&line1=%5Csqrt%7B3[%5Ccos(%5Cfrac%7B4%CF%80%7D%7B9%7D)%2Bi%5Csin(%5Cfrac%7B4%CF%80%7D%7B9%7D)]%7D&line2=%5Cmathrm%7BSolution:%5C:%7D%5Csqrt%7B3%7D%5Csqrt%7B(-1)%5E%7B%5Cfrac%7B4%7D%7B9%7D%7D%7D)
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![Find the values of the cos^(-1)[cos((4pi)/3)]](https://static.doubtnut.com/ss/web-overlay-thumb/2310820.webp)
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