![Toán 12: Cho hàm số f(x) có bảng biến thiên như sau. Số nghiệm thuộc đoạn [-π;2π] 4f(cos(2x))+5=0](https://1a-1791.com/video/s8/1/7/u/i/3/7ui3t.fP4e-small-Ton-12-Cho-hm-s-fx-c-bng-bi.jpg)
Toán 12: Cho hàm số f(x) có bảng biến thiên như sau. Số nghiệm thuộc đoạn [-π;2π] 4f(cos(2x))+5=0
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