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tui đố các bạn giải bài này nè đúng tui tk cho nếu đúng á thì IQ 2000000 luôn

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ko ai giải đc  hahahahaha

Nhớ giải chi tiết

Câu 3: Trong không gian Oxyz , gọi φ là góc tạo bởi hai vectơ a→ = (4; 3; 1); b→ = (-1; 2; 3). Trong các khẳng định sau, khẳng định nào đúng?

Từ đồ thị (H.1, H.2) hãy chỉ ra các khoảng tăng, giảm của hàm số y = cosx trên đoạn $\left[\frac{–\pi }{2};\frac{3\pi }{2}\right]$ và các hàm số y = |x| trên khoảng (-∞; +∞).