Cho hàm số \(y = f(x)\) liên tục trên \(\mathbb{R}...
Câu hỏi: Cho hàm số \(y = f(x)\) liên tục trên \(\mathbb{R}\) và có đồ thị như hình vẽ. Gọi \(S\) là tập hợp tất cả các giá trị nguyên của tham số \(m\) để phương trình \(\left| {f(2\cos x - 1)} \right| = m\) có nghiệm thực thuộc khoảng \(\left( { - \dfrac{\pi }{2};\dfrac{\pi }{2}} \right)\). Số phần tử của \(S\) bằng![](data:image/jpeg;base64,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)
A \(2.\)
B \(3.\)
C \(5.\)
D \(4.\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 - Thầy Chí - Đề số 8