_1. In the second quadrant, the graph of y = sin x goes from_. В. 1 to 0 C. 0 to -1 А. -1 to 0 D. 0 to 1 2. Which of the following is NOT the key point of the graph of y = sin x? A. (180°, 1) В. (360°, 0) C. (-90°, -1) D. (270°, -1) 3. Which of the following is the amplitude of y = 5 sin 3x? В. З С. 1/5 А. 5 D. 1/3

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