Trắc nghiệm Toán học 11 chân trời sáng tạo bài 3 Các công thức lượng giác

A A. $\cos(x)$ B B. $-\cos(x)$ C C. $\sin(x)$ D D. $-\sin(x)$

A A. $-\frac{4}{3}$ B B. $\frac{4}{3}$ C C. $-\frac{3}{4}$ D D. $\frac{3}{4}$

A A. $-\sin(x)$ B B. $\sin(x)$ C C. $-\cos(x)$ D D. $\cos(x)$

A A. $-\frac{7}{9}$ B B. $\frac{7}{9}$ C C. $-\frac{1}{3}$ D D. $\frac{1}{3}$

A A. $2\sin(\frac{x+y}{2})\cos(\frac{x-y}{2})$ B B. $2\cos(\frac{x+y}{2})\sin(\frac{x-y}{2})$ C C. $2\sin(\frac{x+y}{2})\sin(\frac{x-y}{2})$ D D. $2\cos(\frac{x+y}{2})\cos(\frac{x-y}{2})$

A A. $-\frac{4}{5}$ B B. $\frac{4}{5}$ C C. $-\frac{1}{5}$ D D. $-\frac{3}{5}$

A A. $-\frac{\sqrt{3}}{2}$ B B. $\frac{\sqrt{3}}{2}$ C C. $-\frac{1}{2}$ D D. $\frac{1}{2}$

A A. $\tan(x)$ B B. $-\tan(x)$ C C. $\cot(x)$ D D. $-\cot(x)$

A A. $-\frac{\sqrt{3}}{2}$ B B. $\frac{\sqrt{3}}{2}$ C C. $-\frac{1}{2}$ D D. $\frac{1}{2}$

A A. $-\sqrt{8}$ B B. $\sqrt{8}$ C C. $-\frac{1}{\sqrt{8}}$ D D. $\frac{1}{\sqrt{8}}$

A A. $2\cos(\frac{x+y}{2})\cos(\frac{x-y}{2})$ B B. $2\sin(\frac{x+y}{2})\cos(\frac{x-y}{2})$ C C. $2\cos(\frac{x+y}{2})\sin(\frac{x-y}{2})$ D D. $2\sin(\frac{x+y}{2})\sin(\frac{x-y}{2})$

A A. $-\frac{7}{9}$ B B. $\frac{7}{9}$ C C. $-\frac{1}{3}$ D D. $\frac{1}{3}$

A A. $-\frac{\sqrt{5}}{3}$ B B. $\frac{\sqrt{5}}{3}$ C C. $-\frac{2}{3}$ D D. $\frac{2}{3}$

A A. $\frac{1}{3}$ B B. $-\frac{1}{3}$ C C. $-\frac{3}{1}$ D D. $-\frac{1}{2}$

A A. $\tan(\frac{x}{2})$ B B. $-\tan(\frac{x}{2})$ C C. $\cot(\frac{x}{2})$ D D. $-\cot(\frac{x}{2})$