Cho hàm số \(y=f(x)\) có đạo hàm trên R, biết rằng...
Câu hỏi: Cho hàm số \(y=f(x)\) có đạo hàm trên R, biết rằng hàm số \(y=f'(x)\) có đồ thị như hình vẽ bên. Số điểm cực đại của hàm số \(y = f\left( {6 - {x^2}} \right)\) là![](data:image/png;base64,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)
A. 1
B. 7
C. 3
D. 4
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2019 môn Toán Sở GD & ĐT Hà Tĩnh