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Câu 4:

Cho hàm số $f(x) = cosx -x$

Câu 4:Cho hàm số f(x)=cosx−xf(x) = cosx -xf(x)=cosx−x. Khẳng định nào dưới đây đúng?

Thông tin câu hỏi

Câu 4:
Cho hàm số $f(x) = cosx -x$ . Khẳng định nào dưới đây đúng?